This Spectre twin metal sleeved high performance 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. Keyless mechanism for quick & easy accessory changes. Spectre Tools is a quality brand of tools and equipment available exclusively through selected dealers. KINDLY REMINDER: Delivery to the UK Highlands, Channel Islands, Northern Ireland, Isle Of Wight, Isle Of Man and the following postal code areas: BT, FK, KA (1-30), PA(1-49), PA(60-78),PA80, PH, PH(11-40), PH(41-44), PH(49-50), AB, IV, KW, ZE, GY(1-10), JE(1-5), PO(30-41), IM, IR, HS are excluded from our standard delivery charge and may incur extra costs.