Norton Gemini aluminum oxide bench and pedestal wheels provide maximum cut rate and cool cutting action on hardened or high-speed tool steels and other metals. Bench and pedestal wheels are used for offhand deburring and sharpening of parts and tools. Arbor bushings to 1/2", 5/8", 3/4", 7/8". Specification: Medium 60. All bench and pedestal wheels must be dressed to prevent loading. Loading can cause excessive heat, damage to the workpiece and wheel breakage. Dressing exposes new cutting edges and provides chip clearance. Do not grind wood, plastic or any other non-metallic material on a bench or pedestal grinder. Unsecured machines can move, causing grinding breakage and injury. Fixed-base bench and pedestal grinders must be secured.