... clay,quarrying,mining,construction button bit 2.button,thread,tapered bit 3.chisel,cross,button etc Oil ... 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 ... energy rock drills, under the condition of flake set piece than chisel bit strong applicability hammer, ...