Grinding triangles, HOLZ & LACK, silver grinding, corundum, 100 x 62, 93 mm, sprinkled aluminum oxide, stearate coating, reduces premature grain blockage, fully synthetic resin, reinforced carrier material, with velvet for use, in velvet, for delta sander, for grinding Hard and soft wood, synthetic resin varnish, acrylic varnish, paint, plastic.