Compatible with most angle grinders and die grinders featuring a 7/8″ (22.23mm) arbor, it operates at speeds up to 13,300 RPM and supports both dry and wet cutting. 【Universal Compatibility】The 4-1/2″ diamond cut off wheel fits most die grinders equipped with a 7/8″ (22 mm) arbor hole and works seamlessly with both dry and wet cutting.