... Ingersoll-Ran We are a professional company which is specialized in making and researching on drilling equipments as well, and our ... , Sandvik, Ingersoll-Rand etc. The equipments are widely used in earthwork projects, minerals exploiting, well-digging projects and foundation constructions ... Thread Rod---R25,R28,R32,R38,T38,T45,T51. Integral Drill Rod---H19/H22, Diameter---20mm - 42mm. tapered drill bit