Allows you to mix and combine player sizes compatible with your shots, ratchet handles, extensions and other accessories. The spring ball bearing on the head rests the holds securely. Suitable compatible with Quick Change 1/4 in Chuck Systems or directly in the drill This set is perfect compatible with your impact driver or drill, and allows you to replace your ratchet with a power tool. Hex shank fits all quick-change chucks and standard Turns any electric drill into an electric nut driver; packaged display. Saves time on traditional manual braces. compatible with heavy impact engines. colour:black Material:Chrome vanadium steel hex shank adapter post size:12.5mm ,10 mm ,6.35mm converter includes sizes 1/2-inch (F) x 8/3 in (M), 3/8-inch (F) x 1/4-inch (M), 3/8-inch (F) ) x 1/2 inches (M), 4/1 inches (F) x 8/3 inches (M). Package Contents: 6 x hex shank adapter post 8 x sleeve adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.