This Draper 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, Milwaukee, Dewalt and Bosch.