Great Neck OEM 2541F Fine Grit, 4-Inch 3-Piece Replacement Stone Set for Great Neck OEM Adjustable Engine Cylinder Hones Model 25041
OEM Cylinder Hone Replacement Stone Set contains three (3) 4-inch stones.  Fine grit (400). Fits OEM Adjustable Engine Cylinder Hone model 25041 and most other major brands.