4.5” AFS Don't be fooled by its size, the performance of this little sander is outstanding. It's an excellent choice for sanding around fender openings, small parts like motorcycle side covers, tanks, automotive bezels, mirrors and garnish molding or objects with small lows or sharp curves. Made out of 8lb. density foam, has a .008" thick base plate. Come with 3 - 1/8" rods and end caps of course.