BESTLINK quick drilling T38 T45 T51 R32 R38 Standard and Retrac Thread Button drill Bit for wholesales OEM and ODM--- We can design and manufacture according to customers's samples or drawings of the Bit Dia., No. Of air/water holes, carbide button shape and the face shape. Super Quality--- Our button bit is 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.