[Used for]5/8 inch heavy duty magnetic drill chuck. [Capacity]Chuck capacity from 1/8 inch to 5/8 inch (3mm-16mm). [Component]With collet key [Installation]The taper end of the drill chuck is pressed into the chuck size: 3.0-16mm Material: Metal colour: As shown Package Contents: 1 x drill chuck 1 x collet key Only 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.