DescriptionThis drill chuck has unique locking function, self-locking methods, more effective in preventing work loose off. Instantly convert impact driver to hold non-quick change drill and driver bits. Easily locks onto and releases drill bits.Features- Color: As shown. - Material: Carbon Steel. - Size: About 6x4x4cm. - Clamping range: 0.3-4.0mm. - Tail hole diameter: 8mm. - Chuck easily locks onto and releases drill bits. - Made of material, strong and durable. - Can be used with drill bits from 0.3mm to 4mm. - Sturdy and durable, very practical. - Applicable machine tool: manual electric drill, lifting mill, DIY manual electric drill.