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 drillThis set is perfect for your impact driver or drill, and allows you to replace your ratchet with a power tool.Hex fits all quick-change chucks and standardTurns any electric drill into an electric nut driver; packaged display.Saves time on traditional manual braces.for heavy impact engines.colour:blackMaterial:Chrome vanadium steelhex adapter post size12.5mm 10 mm 6.35mmconverter 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/setPackage Contents:3* hex adapter post4* sleeve adapterOnly 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.