Metal cutting, industrial quality blade. Ideal for cutting and chopping applications on all 7" and 8" circular saws. Metal arbor to prevent shearing. 5 8" round, diamond arbor. No. DW3508: 6 1 2" diameter, maximum speed: 9400 RPM, Available Only At Woodburn, Mesquite. No. DW3511: 7" diameter, maximum speed: 8700 RPM No. DW3531: 8" diameter, maximum speed: 7600 RPM, Available Only At Woodburn, Mesquite.