No matter new buyer or old purchaser, We believe in long expression and trusted relationship for China Rock Drill Button Bit Rock Bit Carbide Threaded Button Bits, We've been glad that we've been steadily developing along with the active and long lasting assist of our pleased buyers! No matter new buyer or old purchaser, We believe in long expression and trusted relationship for Drill Button Bit, Rock Drill Button Bit, Taper Button Drill Bit, We set a strict quality control system. We've return and exchange policy, and you can exchange within 7 days after receive the wigs if it is in new station and we service repairing free for our goods. Be sure to feel free to contact us for further information if you have any questions. We have been glad to work for every client. Drifting and tunnelling tools include rods, shank adapters, couplings and bits. We have mainly 3 threads: R25, R28 and R32. Diameter: 38-127mm,They can be used with button bits, cross bits and reaming products. Thread button bits   made with high quality of best quality alloy steel bar and tungsten carbides, through heat treatment so that it can withstand the toughest rock drilling demands，and transmit intensive impact energy into the rock with the least possible loss of energy Especially our BIT R28 37mm，R28  38mm,R32 45mm,R32 x 48 mm,BIT R32  51mm, Button Bit ,Retrac Bit, which is widely welcomed by our client with good quality and good price . Especially our H35，TUN ROD T38-Hex35-R32，ROD R32 H28 R28，MF rod, which is widely welcomed by our client with good quality and good price .