A multipurpose tool conceived for sanding on concave, convex and flat shaped surfaces thanks to special plates attached to a hand block body. The replacement of the different plates is quick and easy. 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 = 6.3"", Concave with R = 2"", Concave with R = 3.9"" and Flat). Mirka® Hand Sanding Blocks are specially designed for sanding by hand in combination with Mirka’s revolutionary net-sanding products, although they can also be used with other grip abrasives. To ensure dust-free sanding the hand sanding block simply needs to be connected by hose to a dust extraction system.