Allows you to mix and combine player sizes for your , ratchet handles, extensions and other accessories. The spring ball bearing on the head rests the holds securely. Suitable for Quick Change 1/4 in Chuck Systems or directly in the drill This set is perfect for 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. for heavy impact engines. colour:black Material:Chrome vanadium steel hex shank adapter post size12.5mm 10 mm 6.35mm converter includes sizes 1/2-inch (F) * 8/3 in (M), 3/8-inch (F) * 1/4-inch (M), 3/8-inch (F) ) * 1/2 inches (M), 4/1 inches (F) * 8/3 inches (M). Quantity:7pcs/set Package Contents: 3* hex shank adapter post 4* sleeve adapter Only the above package content, other products are not included. Note: Light 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.