Material: Made from high quality materials. Made of hard alloy. Small size, easy to carry. Used to check power drill tool for leaks or looseness. Thumb Grip Styles: Built for performance. Thumb grips increase leverage and user comfort. Mild steel handles limit the potential for dangerous breakage under excessive load. Easy to use: The product is easy to use. Spare key with black surface. Suitable for checking the tightness of the coward of electric drills. Very practical: will check the tightness of the play of the clamping tool of the electric drill. On all common drills with toothed crown. Can be used in hammer or drill mode, very durable, comfortable to grip. Application: Suitable for most drills and other power tools. Ideal for home improvement projects. Ideal for use with hammer drills where a tight fit is required. Features: - Made of hard alloy. Small size, easy to carry. - Used to check the tightness or play of the power drill tool. - Can be used in hammer or drill mode, very durable, comfortable to grip. - Used with drills, flexible sanders and more. - Ideal for tightening and loosening jaws on a drill chuck. Specification: Material: Hard Alloy Color: Black Size: As the picture show Package Content: 1*Wrench of 10mm chuck 1 * 13mm chuck key 1 * 16mm chuck key 1 * 20mm chuck key