Features ROBUST AND DURABLE: The main body is made of high carbon steel, with high precision threads and tapering, closely combined with the anti-rust chrome coating body and the electrophoretic paint coating of the sleeve, very durable with long service life. FOR IMPACT SCREWDRIVER: 1/2 inch impact wrench chuck is suitable for 1.5-13mm (1/16-1/2 inch) drill bits for standard impact screwdrivers. FOR MILLING AND LATHE: The 3-jaw chuck can be mounted on a column drill, a milling cutter or a head or a tailstock on a wood or metal lathe which is useful and practical. FOR DRILLING OPERATIONS: Widely used for heavy drilling operations, such as drilling hard materials such as walls or stones. TIME & EFFORT SAVING: With this 1/2 inch 1/4 inch hex adapter installed, it is very easy to convert an electric impact screwdriver into a drill, saving time and effort. Specification: Item Type: 3 Jaw Drill Chuck Material: high carbon steel Clamping range: approx. 1.5~13mm/0.06~0.51inch Drill Spindle Connecting Thread: 1/2-20UNF For: Impact screwdriver conversion for 1/2 inch fittings Package List: 1x Chuck 2 Conversion Heads 1 x circular ring 1 Location Pin 1 x Key Package List 1 x Chuck 2 x Conversion Head 1 x O Ring 1 x Locating Pin 1 x Key