Weiler Tiger Grinding Wheels Triple fiberglass reinforcement provides added strength for aggressive stock removal. Type 27 grinding wheels are designed with fiberglass back from the edge to provide instant aggressive grinding right out of the box. Type 28 grinding wheels with a concave, or saucer, shape are designed for increased aggression at lower working angles and increased access to the work piece. Choose from aluminum oxide (AO), ceramic alumina, and zirconia alumina abrasives materials. Grinding wheel and /grind combo wheel types available Pack of 10