SIOUX VALVE SEAT GRINDER STONE SET OF 24 PCS WITH SIOUX STONE HOLDER 11/16" THREAD STAR DRIVE BALL AND SHAFT. VITRIFIED BOND 80 GRIT MEDIUM. ALUMINIUM OXIDE PINK STONES 25MM (1") TO 38MM (1.1/2") STONE SIZES :- 2.1/2" - 2 PCS, 2.3/8" - 2 PCS 2.1/4" - 2 PCS, 2" - 2 PCS , 1.7/8" - 2 PCS, 1.3/4" - 2 PCS, 1.5/8" - 2 PCS, 1.1/2" - 2 PCS, 1.3/8" - 2 PCS, 1.1/4" - 2 PCS, 1.1/8" - 2 PCS 1" - 2 PCS STONE THREAD - 11/16" 1pc SIOUX HOLDER 11/16" THREAD STAR DRIVE with Ball THESE STONES CAN BE DRESSED TO ANY ANGLE BULK QUERY