HHIP 2220-0018 Diamond Shape-Fine Knurling Wheel, 3/4" x 3/8" x 1/4" Pitch Fine; Lines/Inch 33 Sold and supplied in Pair; Diamond; High speed steel High speed steel .Dimension: 3/4 (O.D.)x3/8 (Width)x1/4" (Hole) Diamond Dimension: 3/4 (O.D.)x3/8 (Width)x1/4" (Hole); Sold and supplied in Pair Dimension: 3/4 (O.D.)x3/8 (Width)x1/4" (Hole)