A multipurpose tool for sanding on concave, convex, and flat surfaces. Special plates attach to a hand block body quickly and easily. This kit contains a hand block body 2.75" x 7.75", a hose adapter Ø 20/28 mm outer diameter and 4 changeable plates (Convex with R = 6.25", Concave with R = 2", Concave with R = 4" and Flat).