[premium quality]: these flap discs are constructed with industrial grade premium zirconia abrasive for strength, durability, and extended disc life as it holds up to high temperatures and pressure.[surface finishing]: each disc is made with fine 120 grit zirconia alumina making this abrasive flap disc ideal for surface conditioning while removing unwanted texture and material on hard workpieces like metal.[bevel]: these bevel type 29 discs are angled to be more effective for contours, edge and weld blending, and radius grinding.[resin fiber]: the resin fiber by the fiberglass backing plate absorbs vibrations without smearing or contaminating workpiece during usage.[specifications]: each disc measures at a 4-1/2-inch diameter with a 7/8-inch arbor size, making with grinders with a speed of up to 13,300 rpm. ¿Por qué comprar con nosotros? -Somos Mercado Líder con más 15 años de experiencia en Mercado Libre y miles de operaciones concretadas -Nuestros productos son nuevos y originales -Atención al cliente mediante mensajería de Mercado Libre de Lunes a Domingo -Te ofrecemos 1 mes de garantía en caso de que el producto no funcione o llegue dañado -Tu compra y tus datos están protegidos