Our Stainless Steel Adaptor Chuck is an all purpose chuck that comes with 2 collets and works with a full range of wire gauge drill sizes. this makes the task of centering small drill bits in a hand or electric drill simple and wasy. The chuck has a cross drilled hole allowing you to easily tighten larger drills. Together, the collets have a range of 0"-.094" (#42-#80). Precise and strong, these chucks have a poular 1/8" shank and can be run at 15,000 RPM. MADE IN THE USA