Britool Hallmark 19pc 3/8" Drive Deep 12 Point Impact Socket Set 6-24mm Cr-Mo

The Britool Hallmark 19-Piece 3/8" Drive Deep Bi-Hexagon Impact Socket Set provides professional-grade performance for automotive, mechanical, engineering and workshop applications requiring additional socket reach and a 12-point profile.

Manufactured from high-quality Chromium-Molybdenum (Cr-Mo) steel and heat treated for strength and durability, these sockets are engineered to withstand the repeated torque and shock loads associated with compatible pneumatic air tools, cordless impact wrenches and powered impact tools.

Each socket features a 12-point / bi-hexagon profile, providing additional engagement positions for easier alignment with compatible fasteners. Combined with the deep socket design, this makes the set particularly useful when working with recessed fasteners, longer studs and components in restricted or awkward areas.

Britool's Stress Relief Drive system is incorporated into the socket design to maximise effective torque transfer while helping minimise unnecessary wear and damage to fasteners.

Covering every metric size from 6mm through to 24mm, this comprehensive 19-piece set provides excellent coverage for professional automotive and workshop applications.

Key Features

• Genuine Britool Hallmark professional impact socket set
• 19-piece metric set
• 3/8" square drive
• Sizes 6mm-24mm
• Deep / long-reach socket profile
• 12-point / bi-hexagon design
• Premium Chromium-Molybdenum (Cr-Mo) steel
• Heat treated for strength and durability
• Designed for compatible air and power tools
• Britool Stress Relief Drive system
• Ball retaining groove for positive drive connection
• Side holes for optional pin-and-ring retention
• Laser-marked Hallmark logo and individual part numbers
• Individual replacement sockets available
• Corresponding standard-depth 12-point set available
• 6-point standard and deep alternatives also available

Set Contents

The set contains 19 deep 3/8" drive impact sockets:

6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm and 24mm

Quantity: 19 Sockets
Drive: 3/8" Square Drive
Profile: 12-Point / Bi-Hexagon
Depth: Deep / Long Reach
Material: Chromium-Molybdenum Steel
Type: Impact Sockets

Deep Socket Design

The deep profile provides additional reach compared with a conventional standard-depth impact socket.

This can provide improved access when working with:

• Recessed nuts and bolts
• Fasteners on longer studs
• Engine components
• Automotive suspension
• Transmission and drivetrain assemblies
• Mechanical equipment
• Difficult-to-access fasteners

For professional mechanics regularly encountering a mixture of conventional and recessed fasteners, deep impact sockets provide a useful addition to a workshop tool collection.

12-Point Bi-Hexagon Profile

Each socket features a 12-point bi-hexagon profile, providing additional engagement positions around compatible fasteners compared with a 6-point design.

This can make socket positioning easier where access is restricted or the tool cannot easily be rotated into position.

The profile is particularly useful for professional applications where 12-point fasteners are encountered or where a bi-hexagon impact socket is specifically required.

Chromium-Molybdenum Impact Construction

These Britool Hallmark sockets are manufactured from Chromium-Molybdenum steel and heat treated for use in demanding impact applications.

Cr-Mo construction provides the strength and durability required to withstand the repeated shock loads generated by compatible powered tools.

Suitable applications include use with:

• Pneumatic impact wrenches
• Cordless impact wrenches
• Powered impact tools
• Professional workshop air tools

Always ensure the socket size, profile and tool are appropriate for the fastener and application.

Stress Relief Drive System

Britool's Stress Relief Drive system is designed to provide effective torque transfer while helping reduce excessive stress and wear on compatible fasteners.

This is particularly beneficial in professional automotive and mechanical applications where sockets are regularly subjected to substantial torque.

Socket Retention

Each socket incorporates a ball retaining groove to provide a positive connection with compatible 3/8" square drive tools and accessories.

Additional side securing holes allow an appropriate pin-and-ring retention system to be fitted when additional socket security is required during impact-tool operation.

Professional Automotive & Workshop Applications

The comprehensive 6-24mm size range makes this set suitable for numerous professional applications, including:

• Automotive servicing and repairs
• Engine and drivetrain work
• Vehicle suspension repairs
• Transmission and gearbox maintenance
• Professional garages
• Automotive workshops
• Fleet vehicle maintenance
• Mechanical engineering
• Machinery servicing
• General workshop repairs

The combination of deep reach, 12-point engagement and impact-rated Cr-Mo construction provides a versatile solution for professional mechanics and technicians.

Individual Replacement Sockets

Each socket is laser marked with the Britool Hallmark logo and individual part number, allowing quick identification in a professional workshop.

Individual sockets are also available separately as and when required, making it possible to replace a lost or damaged size without purchasing another complete set.

Alternative Britool Hallmark Impact Socket Sets

Several corresponding Britool Hallmark 3/8" drive impact socket sets are available for workshops requiring different depths or profiles.

MBMPSET19 – Standard Depth 12-Point / Bi-Hexagon

A corresponding 19-piece standard-depth 12-point impact socket set covering the same 6-24mm size range.

MHMPSET19 – Standard Depth 6-Point / Hexagon

A 19-piece standard-depth impact socket set with a 6-point hexagon profile.

MDHMPSET19 – Deep 6-Point / Hexagon

A corresponding 19-piece deep impact socket set with a 6-point hexagon profile for additional reach.

Together, these ranges allow professional garages and workshops to build a comprehensive collection of 3/8" drive standard and deep, 6-point and 12-point impact sockets.

Important Information

• 19-piece 3/8" drive impact socket set
• Sizes 6mm-24mm
• Deep / long-reach profile
• 12-point / bi-hexagon design
• Chromium-Molybdenum steel construction
• Heat treated for impact applications
• Designed for compatible pneumatic and powered impact tools
• Britool Stress Relief Drive system
• Ball retaining grooves
• Side holes for optional pin-and-ring retention
• Individual replacement sockets available
• Standard-depth 12-point alternative: MBMPSET19
• Standard-depth 6-point alternative: MHMPSET19
• Deep 6-point alternative: MDHMPSET19
• Always select the correct socket size and profile for the fastener and application.

The Britool Hallmark Range

The Britool Hallmark range was developed by Britool in the 1980s for the automotive aftermarket and has been a long-established choice for professional workshop users.

Each socket carries distinctive Britool Hallmark branding, providing clear identification and reflecting the professional tooling heritage of the range.

The Britool Hallmark guarantee covers defects in materials and/or workmanship when tools are used for the purpose for which they were designed and for their expected service life.

The guarantee does not extend to fair wear and tear, moving parts such as ratchet mechanisms, or consumable items such as bits and repair kits.