This BAP twin plastic sleeved keyless chuck can be used for both cordless and corded power tools, air tools and drill presses with the following specification Fitment: 1/2 inch x 20 UNF Hardened and tempered steel is used for the bit clamps at the head and are toothed to make sure you have a tight grip on your drill bit. Fully compatible with all the major power tool brands, including Makita, Dewalt and Bosch. Features Keyless chuck for corded and cordless drills. Heavy-Duty keyed chuck for both Hand and Impact drills. 1/2"-20 UNF female thread. Capacity 2.0-13mm. Adaptor with 6.35mm(1/4") Hexagon shank, adaptor shank length. Handle type: square or round.