Meant for use in die grinders, flap wheels are versatile coated abrasive tool. They are made from aluminum oxide for long life and used on all ferrous and non-ferrous materials such as stainless steel, iron, brass, aluminum, plastic,fiberglass, wood and glass. They are excellent for working in small, hard to reach places and have a 1/4" shank for use in die grinders and standard drills.