Metabo® Cut-off Wheel, Heavy Duty, series: Original Grinding® Long Life, 6 in Wheel dia, 1/4 in Wheel Thickness, 5/8 in Center Hole, 24 Grit, Coarse Grade, Aluminum Oxide Abrasive, 10200 RPM Maximum, Resin Bond, Applicable Materials: Steel and Ferrous Metals, 5/8-11 Center Hole Thread Size, Wheel Type Number: Type 27, Wheel Hardness: R. Metabo® 655319000 Original Grinding® Long Life Heavy Duty Cut-Off Wheel, 6 in dia x 1/4 in Thick, 5/8 in Center Hole, 24 Grit