The 30-piece set Wera Bit-Check 30 impactor 1 consists of 29 impactor bits with different profiles and an impactor bit holder to cushion extreme impulse peaks, with special torsion effect by Doppeltorsionsfeder, with retaining ring for the secure fit of the bits in the holder and 1 / 4 "hexagon. the 29 bits have a diamond coating to reduce the risk of slipping. the tiny diamond particles bite formally working in the screw. the impactor technology provides through optimum utilization of the material properties and optimally designed geometry above-average service life even under extreme demands. This set is particularly suitable for use with commercial Impakt- or impact wrenches. In the workplace can be the bit checks stand,so is the tool always ready to hand.