Which blades fit into this handle?

This blade-holding handle is exclusively designed for Wera Kraftform Kompakt VDE interchangeable blades with a 9 mm hex drive.

Is this handle safe for electrical installations?

Yes, it is VDE-certified and individually tested according to IEC 60900 for safe working up to 1,000V.

How does the built-in ratchet mechanism work?

The fine-tooth ratchet features 40 teeth with a 9° return angle and offers clockwise, counterclockwise, and locked 0 positions.

Are interchangeable blades included with this item?

No, this product includes only the 837 i RA blade-holding handle (9 x 115 mm). Compatible VDE blades are sold separately.

Can standard 1/4" screwdriver bits be used directly?

No, standard 1/4" bits do not fit. The 9 mm socket is designed specifically for dedicated VDE blades.

WERA 837 i RA Kraftform holder with ratchet function 9 x 115 mm - 05057490001

Name: WERA 837 i RA Kraftform holder with ratchet function 9 x 115 mm - 05057490001
Brand: WERA
SKU: 08103773
Price: 37.8 EUR
Availability: PreOrder

Supplier number: WERA 05057490001 | EAN 4013288229700

Recommended Retail Price €82.29

37.80 tax incl.

€31.24 excl. VAT (incl. all environmental contributions)

On order: delivered from 22/10/2026

Ordered before 20:00 - delivered as of 22/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

✆ Talk to a specialist

Fast ratcheting with Wera bitholder

Practical benefits

Integrated fine-tooth ratchet: The built-in 40-tooth ratcheting mechanism allows you to drive screws rapidly without needing to reset your grip.
Ergonomic grip maximizes torque: The multi-component handle shapes naturally to your hand, preventing blisters while providing excellent power transmission.
Certified VDE electrical safety: Individually tested components ensure you stay safe and protected against electrical hazards up to 1000V.

In a nutshell

The right choise for

With the Wera 837 i ra Kraftform blade-holding handle, you drive screws quickly and precisely during electrical installation work. The built-in 40-tooth fine-ratchet mechanism with a 9° return angle lets you work continuously without repeatedly repositioning your grip, speeding up repetitive fastening tasks inside tight distribution boards and electrical cabinets. Designed with the ergonomic Kraftform handle, it fits comfortably in your palm, prevents blisters, and delivers smooth, powerful torque transfer. Paired with compatible 9 mm Kraftform Kompakt vde interchangeable blades, this handle provides certified safety for live electrical work up to 1000V, keeping your toolkit compact, efficient, and dependable on every job.

Product information FAQ

€37.80

tax incl.

Key features according to our expert

Bit holder size: 9 mm
Bit holder type: Internal hexagon
VDE approved: Yes
With safety colour code 1000V: No
ESD: No
Non-sparking: No
Product Range: Wera Kraftform

Scope of delivery

837 i RA Kraftform blade-holding handle with ratchet functionality, 9 x 115 mm

Product description

Bitholding screwdriver for Wera Kraftform Kompakt VDE blades with ratchet with fine toothing integrated in the handle (40 teeth/return angle 9°). The ratchet accelerates screwdriving without having to reposition the tool. The ratchet mechanism completely embedded in the handle ensures very handy and comfortable work. The handle/blade system allows for lightning-fast change of the required blade and thus a wide range of applications.

Kraftform Kompakt VDE bladeholding screwdriver with ratchet functionality
The integrated ratchet with fine toothing ensures fast and safe working
High working speed: The ratchet can also be used to "spin" when screwdriving
Ergonomic intuitive switching to clockwise/counterclockwise or position 0
Kraftform Plus handle for comfortable ergonomic work

Application

Solely for Wera VDE blades

Design

Ratchet with fine toothing integrated in the handle (40 teeth, return angle 9°)

Handle

Kraftform with anti-roll protection, multi-component

Features and benefits

The integrated ratchet with fine toothing (40 teeth and a return angle of 9°) eases and accelerates screwdriving without having to reposition the tool.
The ratchet mechanism also allows fast "spinning" while screwdriving.
The individual testing at 10,000 volts, in accordance with IEC 60900, ensures safe working with loads up to 1,000 volts.
The basic idea for the prototype of the Kraftform handle - that the hand should dictate the design - has, right through to today, proved to be correct. In cooperation with the internationally recognised Fraunhofer IAO Institute, Wera developed a screwdriver handle designed to match the shape of the human hand as long ago as the 1960s. After a long development phase, the Wera Kraftform handle was launched to the market in 1968. It has been optimised through the years with new technologies, but has kept its proven shape. After all, the human hand has not changed either.

All Features

Bit holder size: 9 mm
Bit holder type: Internal hexagon
Vde approved: Yes
With safety colour code 1000v: No
Esd: No
Non-sparking: No
Product range: Wera Kraftform

Brand WERA
08103773
EAN 4013288229700
Supplier number WERA 05057490001

Frequently asked questions about this product

Answered by specialists

Which blades fit into this handle?: This blade-holding handle is exclusively designed for Wera Kraftform Kompakt VDE interchangeable blades with a 9 mm hex drive.
Is this handle safe for electrical installations?: Yes, it is VDE-certified and individually tested according to IEC 60900 for safe working up to 1,000V.
How does the built-in ratchet mechanism work?: The fine-tooth ratchet features 40 teeth with a 9° return angle and offers clockwise, counterclockwise, and locked 0 positions.
Are interchangeable blades included with this item?: No, this product includes only the 837 i RA blade-holding handle (9 x 115 mm). Compatible VDE blades are sold separately.
Can standard 1/4" screwdriver bits be used directly?: No, standard 1/4" bits do not fit. The 9 mm socket is designed specifically for dedicated VDE blades.

Questions about this product?

Our product specialists are happy to help with any questions about this range. Call, email or chat with us!

Chat with us

0800 0226 945 [email protected]