Size: 6" diameter, 1" wide, 1/2" bore, 150 grit, and possesses a 4140 maximum RPM. 1/2" spindle hole size fits most brands of 6" benchtop grinders and workbenches Upgrade: Compared with the white corundum grinding wheel, our grinding wheel is added with iron oxide. This greatly improves the toughness and thermal stability of the grinding wheel, thus improving the service life and grinding effect of the grinding wheel 100% Balanced: Each grinding wheel has been dynamically balanced and tested to ensure smooth operation during use Application: White corundum is used for grinding alloy steel, high-speed steel, and quenched steel with higher hardness. It is very suitable for sharpening woodworking tools, drill bits, and milling cutters Upgrade your grinding wheel: If you require the best grinding results, please view UF-SHARP CBN grinding wheel. CBN grinding wheel is sharper, more durable, does not produce dust, and does not require dressing UF-SHARP 6 inch Bench Grinder Wheels, 1/2" Arbor, 150 Grit Aluminum Oxide Grinding Wheel for HSS and Carbon Steel Tools Size: 6" diameter, 1" wide, 1/2" bore, 10 grit, and possesses a 4140 maximum RPM. 1/2" spindle hole size fits most brands of 6" benchtop grinders and workbenches Compared with the white corundum grinding wheel, our grinding wheel is added with iron oxide. This greatly improves the toughness and thermal stability of the grinding wheel, thus improving the service life and grinding effect of the grinding wheel.