DIN 3126/ISO 1173 Form D 6.3 for 1/4" screwdriver bitsInner hex with ring compression springBits are easy to insert, snap securely into placeReversible, with a push-out functionTo work in confined spaces, with a working angle of only 4.5° (80 sprockets)With 2-component handleFOD-preventive due to screw-less design