The Mercer 396MRN is a 4-1/2 x 7/8-Inch Aluminum Oxide Prep Wheel. This Mercer Prep Wheel can be used with any 7/8-Inch arbor grinder. Features: * Type 27 shape * Available with 7/8-Inch-11 threaded hub * Non-woven synthetic fiber impregnated with abrasive grain * Three different grades What"s In The Box: * Mercer 396MRN 4-1/2-Inch x 7/8-Inch Aluminum Oxide Prep Wheel