3M Green Corps Type 27 Depressed Center Wheel is a grinding wheel designed for heavy stock removal on most materials, including ferrous metals, stainless steels, alloy steels and cast iron. 3M Green Corps Type 27 Depressed Center Wheel is a heavyduty wheel designed to perform at the beginning of a project as a grinding wheel, its often the first step in a sequence. Use this wheel for rough grinding applications like beveling, slag removal, weld grinding and edge work on a variety of metals. Features. Designed for grinding and stock removal. May be used on a variety of substrates, from ferrous metals to stainless steel. 3M ceramic abrasive grain cuts fast and helps prolong abrasive life. Use with tools and accessories that match Type 27 wheels. For safety, always use with an approved guardSpecifications. Abrasive Material Ceramic. Center Hole Size 5/811. Grit 24. Wheel Diameter 4 1/2 inch. Country of Origin Thailand. Weight 9.23 lbs