DEWALT DW8414 4-1/2" X 1/4" X 7/8" Stainless Steel Grinding Wheel High performance aluminum oxide grain for long life and high material removal 7/8-inch arbor with A30S specs Ideal for specialty grinding for heavy metals (stainless steel, super alloys) Max RPM 13,300 One Year Warranty, One Year Service, 30 day no risk satisfaction