The Conical Cup Wheels deliver a long lifetime when grinding stone and concrete. Its high-quality silicon carbide abrasive grain is designed for endurance with application. It is intended for grinding stone and concrete. It is suitable for use with two-handed angle grinders with a maximum speed of up to 8500rpm. For best results and safety, the Conical Cup Wheels are intended for use with two-handed angle grinders with a maximum speed of 8500 rpm only.