Rock Drilling Tools Button Bits: Manufacturer of Mining and Quarrying Tools Extension Drill Tools (System): R22/R25/R28/R32/R35/T35/T38/T45/T51 A. Shank adapter + M/F Rod + Thread Bit B. Shank adapter + Coupling + M/M rod + Thread bit Surface & Bench Drilling Equipment T38 T45 T51 Min. Order Quantity: 5 Pieces Supply Ability: 6000Pieces Button shape: Spherical, Hemi-spherical, Ballistic Face design: Drop center face, Flat face Skirt: Standard, Retrac Button bit diameter: 38mm to 152mm Button bit thread: R22/R25/R28/R32/R35/T35/T38/T45/T51 Made from top quality steel and tungsten carbide buttons Apply "Hot-Insertion" processing procedure to insert the buttons Optimized designs improve the drilling speed Automatic production line ensure the quality stability Military grade requirements of heat-treatment guarantee durability of the bits.