1.Integral drill steels(Integral Drill Rods)

Shank H22x108mm, H19x108mm,standard hex, Bit diameters include 20-42mm.

2.Tapered drilling tools(Tapered Drill Steel)

Including:

Drill rods with Shank H22x108mm,(6,7,11,12 degree taper) taper rods in most lengths.

button bits, cross type bits and chisel bits with(6,7,11,12 degree taper).

Bit diameter:28mm-57mm.