Please use the chart below to make sure this is the correct stone for your machine. Part No. Mfg. No.         Size             Shape         Grade               Grit       Fits model number(s)                  Usage * Black & Decker K-629    33056         4 x 1 x 5/8     Offset     G.P. & Stellite        60     A, B, C, LW, M, MW, N, NW, NWO      V Sioux K-629        83           4 x 1 x 5/8      Offset     G.P. & Stellite        60     All models except below                     V Thor K-629     73534        4 x 1 x 5/8      Offset     G.P. & Stellite        60     99, 100                                              V    * S refers to Stem Grinder Stone and V refers to the valve face grinder stone WE CARRY A COMPLETE LINE OF AUTOMOTIVE MACHINE SHOP SUPPLIES Please Email or Call if you don't see something listed that you need.