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. Instantly convert impact driver to hold non-quick change drill driver bits. Easily locks onto and releases drill bits. Feature - Color: As shown - Material: Aluminium alloy and carbon steel - Size: 7.5x2.2x2.2cm - Keyless chuck easily locks onto and releases drill bits. Instantly convert impact driver to hold non-quick change drill driver bits. - Can be used with drill bits from 0.3mm up to the size of 6.5mm. - 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 SDS drill. - Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, 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