Size: 8 1/2-- 215.9mm; 12 1/4 -- 311.1mm IDAC:417, 437,447, 517, 527,537, 547 tricone bits TCI (Tungsten Carbide Inserts) with IADC 531, 532, 533, 534, 535, 536 or 537 Sizes: 14 3/4, 12 1/4, 9 7/8 inchesWelcome your any requirementRock bit (Size: 8 1/2-- 215.9mm; 12 1/4 -- 311.1mm)IDACDrill pressureKN/mm Rotary speed (r/min)417, 437,4470.350.924070517, 5270.351.022060537, 5470.451.022050