Wera Bit-Check 30 Diamond Coated Tips (30-Piece Set)Wera Bit Check 30 Diamond Coated Tips (30 Piece Set) Bitorsion Zone to Absorb Peak Loads Enhanced Service Life of the Bits Diamond Coating for Secure fit in the screw, Literally bites into the Screwhead to prevent Cam Out Color Coding According to Profile and Size Includes Universal Bit Holder Bits with tiny diamond particles on the bit tip. This ensures a secure fit in the screw head, reduces the contact pressure required and lowers the risk of