Sioux Valve Seat Grinding Wheels Set 24 Pcs With 11 Pcs Pilot + 2x Stone Holder Product Specification: Grinding Wheels Set 24 Pcs :- 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" VALVE SEAT GRINDER PILOT SET :- SET OF 11 PIECES ACCURATE SIZE Top .385" SIZES AS UNDER :- 5.5MM, 6MM, 7MM, 8MM, 9MM, 10MM , 11MM, 12MM, 5/16",3/8", 11/32" Valve Seat Grinder Stone Holder Sioux :- STONE THREAD - 11/16" 2pc SIOUX HOLDER 11/16" THREAD STAR DRIVE with Ball HEAVY DUTY SIOUX STYLE VALVE SEAT GRINDER STONE HOLDER THREAD 11/16 " With Drive Ball