Ideal for grinding grooves and profiles ideal problem solver for grinding work in confined areas in grooves and on profiles with this set you can sand almost everything perfect for crafting woodworking metalworking painting and more with interchangeable convex and concave profile inserts includes 1 holder 6 profile inserts straight convex large convex small concave v shape trapezoid 9 sanding sheets 3x k80 3x k120 3x k240