We haven't placed much emphasis on these versatile products but the numbers of uses expand constantly. With a 1/4" spindle, they will fit most tools with a 1/4" chuck - drill press and hand-held drills. Bowl turners will appreciate these immediately. Also, works great for finish-sanding of small metal contoured parts. When you've got small concave or convex surfaces to sand, remember Spindle Mounted Flapwheels from KLINGSPOR'S WOODWORKING SHOP.