Aluminum Oxide Cut-off wheel metal type 1 1/4 inches arbor 3 inches Type 1 steel cutting wheel with arbor. Designed for metal cutting, metal abrasion, body work, metal fabrication and general repair work. Used on ferrous materials. Designed to be used on die and air grinders only. Thickness: 1/16 inches. Maximum rpm: 25,465: Tool type: Die/air grinder.