[High Quality Material] This electric drill wrench set with hand is made made of strong metal steel and coated with durable plastic, which is used for replacing lost or damaged chuck keys.^[Size 6-10MM] Universal Chuck 6mm/10mm Keyway Diameter: 6mm/0.24inch; Gear Diameter: 12.5mm/0.49inch; number of teeth: 11. Suitable for a drill chuck from 1.5 to 2. 10 mm.^[Size 13MM] Diameter of the key guide; 13mm Core: 6mm/0.24inch; gear diameter: 17.5 mm / 0.69 inch; number of teeth: 12. Suitable for chucks from 1.5 to; 13 mm.^[Size 16MM] Diameter of the key guide; 16mm Core: 8mm/0.3inch; Gear Diameter: 21.5mm/0.85inch; number of teeth: 11. Fits chucks from 3 & 16 mm.^[Function Overview] There are four sizes of spanners to choose from. electric drills in this group, which are very suitable for locking and cutting. the opening of the drill and at the attachment of the drill bit in the hammer drill.It is suitable for; most brands of power chucks keys.