... requirement. We can manufacture the following types: A. Taper button bitTapered button bit(28mm, 30mm, 32mm, 33mm, 34mm, 36mm, 38mm, ... With different degree taper) Tapered Rod (Rod 19mm, 22mm, 25mm; Shank hex, 19mm, 22mm) Internal Drill rods(chisel bit integral rod. ... 19mm, 22mm; Shank hex. 19mm, 22mm) B. Thread Button BitThread button bit (33mm, 35mm, ...