Sioux Valve Seat Grinding Wheels Set Of 24 Pieces + 11 Piece Pilot + 2 x Stone Holder DESCRIPTION GRINDING WHEELS 24 PIECE SET VITRIFIED BOND 80 GRIT MEDIUM. ALUMINIUM OXIDE PINK STONES 1″ (25.4mm) TO 2-1/2″ (63.5mm) 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 THESE STONES CAN BE DRESSED TO ANY ANGLE VALVE SEAT GRINDER PILOT 11 PIECE 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″ 2 Piece SIOUX HOLDER 11/16″ THREAD STAR DRIVE WITH BALL HEAVY DUTY SIOUX STYLE VALVE SEAT GRINDER STONE HOLDER THREAD 11/16.