... , H19x108mm, standard hex. Bit diameters include 20-42mm.2. Tapered drilling tools (Tapered Drill Steel)Including:Shank H22x 108mm, (6, 7, 11 ... rods in most lengths.A comprehensive range of button bits, cross bits and chisel bits with (6, 7, 11, 12 degree taper).Bit diameter ... , 38mm, etc.8. Blast furnace tap hole drill tools. (Rod, Cross bits, button bits and X-type bits etc). Round Shank Cutter ...