... 1.clay,quarrying,mining,construction button bit 2.button,thread,tapered bit 3.chisel,cross,button etc Oil drill bit ... bit, taper chisel bit and taper cross bit), thread bit( R thread and T thread), retrac bit and dth bit( from 3" ... to 8" are available)I. Thread button bits specifications:1) Bit body : normal type and ... bit sets ,high pressure drill bit and tapered thread drill bit