• enables fast pre-tightening of wheel bolts with max. 75 NM
• mandatory for wheel assembly on vehicles with composite brake disc, used e.g. for BMW, Mercedes
• for use with a 1/2" impact wrench

Due to the design of composite brake discs, the wheel bolts must be tightened in accordance with the manufacturer's specifications when fitting the wheels.

This describes the correct tightening of the wheel bolts in 3 steps:
1. apply crosswise up to max. 20 NM with unloaded wheel
2. crosswise tightening to max. 75 NM with unloaded wheel
3. tighten crosswise to nominal torque according to manufacturer's specification with loaded wheel.

Non-observance can lead to distortion of the entire brake disc. This often results in brake vibrations or running irregularities and the expensive brake discs must be replaced.