Made of aluminum alloy source material, practical and light weight. This drill chuck has unique locking function, traditional locking methods, back having ratchet teeth, the locking pieces mounted on the rear sleeve, more effective in preventing work loose off, so that the clamp chuck,more reliably support tools. An necessary drill work tool that you need. Feature - Color: Black - Material: Aluminum Alloy - Size: 1.80X1.40X1.40cm/0.71X0.55X0.55in - Keyless chuck easily locks onto and drill bits. Instantly convert impact driver to hold non- drill & driver bits. - Adopt aluminum alloy source material, light weight, strong, durable and anti-rusting. - Can be used with drill bits from 0.3mm up to the size of 3.2mm. - Hole design, make it more practical and easy to use. - Unique locking function, traditional locking methods, back having ratchet teeth, the locking pieces mounted on the rear sleeve, more effective in preventing work loose off, so that the clamp chuck,more reliably support tools. - Use ordinary drill bits with your drill, adaptor simply fits into drill as would a drill bit. - Warm Tip: Dear buyer, Due to lighting effect, monitor’s brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 1 x Drill Chuck