Bit set Bit-Check 6. Bits 50 mm long, organised clearly in a small area in the practical Bit-Check. High quality bits for internal square bolts with holding function. The clamping force from the surface pressure between the blade tip and screw profile holds the screws securely in place on the tool. Tempered, for universal use. 1/4" hexagonal, for holders according to DIN ISO 1173-F 6.3.