Forney 71877 Grinding Wheel with 7/8-Inch Arbor, Metal Type 27, A24R-BF, 4-1/2-Inch-by-1/4-Inch The product is 4.5" x 1/4" Grinding Wheel - Metal Type 27 - 7/8" Arbor - Depressed Center Easy to use The product is manufactured in China Aluminum oxide metal grinding wheel Designed for metal grinding, metal abrasion, body work, metal fabrication and general repair work Used on ferrous materials For use on right angle grinders only