Britool Hallmark 1/2" Drive Lock-On Extension Bar 185mm & 310mm, England Made

These Britool Hallmark Lock-On Extension Bars are genuine UK-manufactured professional tools produced in the original Britool factory before its closure. Designed for demanding workshop and engineering applications, they provide a highly secure connection between socket and drive tool, helping prevent accidental socket disconnection during use.

Unlike conventional extension bars, the Lock-On mechanism secures the retaining ball in position, creating a positive connection that makes unintended socket removal virtually impossible. This design is particularly useful when working in confined spaces or on difficult-to-reach fasteners where losing a socket can be costly and time-consuming.

Key Features

• Genuine Britool Hallmark tooling
• Manufactured in the original UK Britool factory
• 1/2" square drive compatibility
• Lock-On socket retention system
• Prevents accidental socket release
• Manufactured from high-quality alloy steel
• Professional workshop quality
• Rare discontinued UK-made stock

Available Lengths

• 185mm
• 310mm

Lock-On Retention System

The Lock-On design:

• Secures the socket firmly onto the extension bar
• Reduces the risk of dropped sockets
• Improves confidence when working in confined areas
• Helps prevent lost sockets during maintenance work
• Provides a more secure connection than standard extension bars

Specifications

• Drive Size: 1/2" Square Drive
• Material: High-Quality Alloy Steel
• Socket Retention: Lock-On Mechanism
• Origin: Made in the UK

Each extension incorporates a ball retaining groove on the square drive, ensuring secure engagement with compatible drive sockets and accessories.

Applications

Ideal for:

• Automotive repairs
• Engineering maintenance
• Industrial servicing
• Heavy-duty workshop use
• Accessing recessed fasteners

Limited Availability

These extension bars were manufactured in the original Britool UK facility before production ceased and are now increasingly difficult to source. Availability is limited to remaining stock only.  Some lengths also available in both 1/4" and 3/8" drives.

The image shown is for illustration purposes and may depict a different length from the item supplied. Please select the required size carefully when ordering.

The Brand

The HALLMARK range was developed by Britool in the 80's for the automotive aftermarket. it has been the professional’s choice ever since. Each tool is marked with the Britool hallmark , your guarantee of quality.

The Britool Hallmark guarantee covers against defective materials and/or workmanship when used for the purpose for which they were designed and for the expected life of the tool. In the unlikely event that a product fails during normal use, it will be repaired or replaced. The guarantee does not extend to fair wear & tear, moving parts such as ratchet mechanisms or consumable items such as bits and repair kits.