HSG Grinder 220 v 50 Hz 5/8'' Hex Ball R.P.M. :- 11000, WATTS :- 550, AMP :- 2.5, VOLTS :- 230/ 50HZ/AC, MAX. WHEEL SIZE :- 2.1/2''. Heavy duty Sioux valve seat grinder stone holder thread of 11/16" inches with drive ball set of 2x Stone Holder Sioux + 4 x Diamond Dresser .50 carat. Verified Bond 80 Grit Medium Alminium Oxide Pink Stones from 25MM (1") to 38MM (1.1/2") stone sizes: 2.1/2" - 3 PCS, 2.3/8" - 3 PCS 2.1/4" - 3 PCS, 2" - 3 PCS , 1.7/8" - 3 PCS, 1.3/4" - 3 PCS, 1.5/8" - 3 PCS, 1.1/2" - 3 PCS, 1.3/8" - 3 PCS, 1.1/4" - 3 PCS, 1.1/8" - 3 PCS 1" - 3 PCS STONE THREAD - 11/16". Sioux Valve Seat Grinder Straight Pilots set Sioux Valve Seat Grinder Straght Pilots set of 12 Pcs set TOP .385" STEM SIZES 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm. Valve Seat Grinder stone dresser stand for Sioux Thread size: 3/8" X UNFLength - 60MM - 1 Piece SIOUX (.385 ") piloted stone holder stand.