Description: Ideal for grinding, polishing work, fit most 4 in.(100mm) angle grinder. Quick remove rust, paint and flaking material. Made of high quality polyurethane fibers. Durable fiberglass plates. Abrasive material: Silicon carbide; Dia.: 4"(100mm); Arbor: 5/8"; Thickness: 1/2 in.(13mm); Max. Speed: 15,200 R.P.M. Include: 10pcs poly stip discs. Warning: always take care and keep away from children. always wear eye protection in work area.