Sioux Valve Seat Grinding Stones Set Of 20 Pcs With 6 Pcs Pilots Top .385"Product Specification: HEAVY DUTY SIOUX STYLE STONES THREAD 11 16" : Set contains each of the following: Stone Sizes 1 1 8" (2 pc Pink) 1 1 4" (2 Pc Pink) 1 3 8" (2 Pc Pink) 1 1 2" (2 Pc Pink) 1 5 8" (2 Pc Pink) 1 3 4" (2 Pc Pink) 1 7 8" (2 Pc Pink) 2" (2 Pc Pink) 2 1 4" (2 Pc Pink) 2 1 2" (2 Pc Pink) STONES CAN BE DRESSED TO ANY ANGLE VITRIFIED BOND 80 GRIT MEDIUM SIOUX VALVE SEAT GRINDER STRAIGHT PILOTS SET : 6 PCS SET TOP . 385" STEM SIZES : 4. 5