Abrasive Cut-Off Wheel Abrasive Material Aluminum Oxide Grit 60 Connector Size 3/8 in Connector Type Unthreaded Hole Overall Diameter 4 in Overall Thickness 0.04 in Compatible Tool Type Cut-Off Tool Die Grinder Primary Material Applicationn Cast Iron Steel Tool Steel Series OBNA2 Wheel Type Type 1 Specification A60-OBNA2 Maximum Operating Speed 19 100 RPM Reinforced Status Reinforced