Eazypower Corporation is a family owned company. It is started by the Kozak family back in 1985. Eazypower offers over 17,000 original items including the patented hexbit drills and Tub-O-Tips rack. Other patented items include one-way screw removers, Spin-it-Out (Damaged Screw Removers), 25in1 screwdrivers and more. Eazypower 30054 3/8" steel drill stop with set screw. 3/8" (9.5mm) steel drill stop. It is constructed from extremely durable steel. Comes with a set screw.