Wera Tools - Bit-Check 30 Diamond 1Bits 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 slipping. BiTorsion bits with a torsion zone where kinetic energy is diverted from peak loads. This greatly extends the product service life. Comes with Rapidaptor technology, which allows bits to be attached without any need to actuate the sleeve. The removal of the bit is simple, just by pushing