Britool Hallmark

Britool Hallmark 12 piece Fixed Extension Bar Set 1/4", 3/8" & 1/2" - SMLES12

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SMLES12 -

£56.65
£56.65 £73.66
VAT included. Shipping calculated at checkout.

The Britool Hallmark SMLES12 12 Piece Fixed Extension Bar Set is a professional-quality collection designed to provide additional reach while maintaining a rigid, positive drive connection. Manufactured from high-quality Chrome Vanadium steel, these extension bars offer outstanding strength, durability, and dependable performance for automotive, engineering, and workshop applications.

Unlike wobble extensions, this set features a fixed extension design, making it ideal where maximum torque transfer and straight-line drive are required. Each extension bar is fitted with a spring-ball socket retainer, securely holding sockets in place during use while allowing quick and easy socket changes.

The comprehensive set includes 1/4", 3/8", and 1/2" square drive extension bars in a range of popular lengths, making it suitable for everything from precision mechanical work to heavy-duty workshop applications.

Supplied in a precision-cut Tool Control EVA foam tray, every extension has its own dedicated location for organised storage and quick identification. Individual replacement extension bars are also available separately if required. A corresponding wobble extension bar set is available under part reference SMLWES12.

Key Features
  • Genuine Britool Hallmark professional quality
  • Fixed extension design for straight, positive drive
  • Manufactured from high-quality Chrome Vanadium steel
  • Spring-ball socket retainers securely hold sockets
  • Suitable for automotive, engineering, and workshop use
  • Tool Control EVA foam tray for organised storage
  • Individual replacement extension bars available
  • Matching wobble extension bar set available (SMLWES12)
Set Contents
1/4" Square Drive Extensions
  • 50mm
  • 75mm
  • 100mm
  • 200mm
3/8" Square Drive Extensions
  • 50mm
  • 125mm
  • 150mm
  • 250mm
1/2" Square Drive Extensions
  • 75mm
  • 150mm
  • 200mm
  • 300mm
Specifications
  • Brand: Britool Hallmark
  • Part Number: SMLES12
  • Number of Pieces: 12
  • Drive Sizes: 1/4", 3/8" and 1/2" Square Drive
  • Design: Fixed Extension Bars
  • Material: Chrome Vanadium Steel
  • Socket Retention: Spring-Ball Retainer
  • Storage: Tool Control EVA Foam Tray
  • Foam Tray Dimensions: Approx. 395mm (L) × 184mm (W) × 35mm (D)
Built for Professional Performance

The fixed design ensures direct torque transfer without movement at the socket, making these extension bars ideal for high-torque fastening where wobble extensions are not suitable. Their durable Chrome Vanadium construction provides long service life, while the spring-ball retention system offers secure socket engagement throughout use.

Ideal Applications

Suitable for:

  • Automotive servicing and repairs
  • Mechanical engineering
  • Industrial maintenance
  • Heavy equipment servicing
  • Workshop and garage use
  • Manufacturing and assembly
  • Professional technicians
  • DIY enthusiasts
Organised Tool Storage

Supplied in a precision-cut Tool Control EVA foam tray, each extension bar is securely stored in its own dedicated position, making tool selection quick and helping to maintain an organised toolbox or roll cab drawer.

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.

Weight & Dimensions

Weight
2.2 kg
Britool Hallmark 12 piece Fixed Extension Bar Set 1/4", 3/8" & 1/2" - SMLES12

£56.65

Frequently Asked Questions

What sizes are included in the Britool Hallmark SMLES12 extension bar set?
The Britool Hallmark SMLES12 12-piece fixed extension bar set includes 1/4", 3/8" and 1/2" square drive extensions in a range of lengths. The 1/4" drive sizes are 50mm, 75mm, 100mm and 200mm; 3/8" drive sizes are 50mm, 125mm, 150mm and 250mm; and 1/2" drive sizes are 75mm, 150mm, 200mm and 300mm.
What is the difference between fixed and wobble extension bars?
A fixed extension bar provides a straight, rigid connection between the drive tool and socket, making it suitable where direct torque transfer and precise control are required. A wobble extension allows a small amount of movement at the socket end, which can be useful for reaching awkward or offset fasteners. Britool Hallmark also offers the SMLWES12 wobble extension bar set for applications where additional flexibility is required.
Can these Britool Hallmark extension bars be used for high-torque applications?
The SMLES12 fixed extension bars are designed to provide a rigid drive connection, making them suitable for demanding automotive, mechanical and workshop applications. They are manufactured from Chrome Vanadium steel and fitted with spring-ball socket retainers. Always ensure the extension, socket and drive tool are appropriately rated for the application and torque being applied. Only suitable for hand use, can not be used with impact rated tools (air, impact or pneumatic).
What are Britool Hallmark extension bars used for?
Extension bars are used to provide additional reach between a ratchet, breaker bar or other square-drive tool and the socket. They are particularly useful for accessing recessed or difficult-to-reach fasteners around engine bays, suspension components, machinery, mechanical assemblies and workshop equipment. The SMLES12 set provides three common drive sizes and multiple lengths for greater versatility.
Are individual replacement extension bars available from the SMLES12 set?
Yes. Individual Britool Hallmark extension bars are available separately, allowing you to replace a missing or damaged extension without purchasing another complete 12-piece set. The SMLES12 set is supplied in a Tool Control EVA foam tray, providing organised storage and making it easy to identify each extension and spot missing tools.