... smooth transmission of motion,reliabie operation and perfect sealing, the structure of the drill is reasonable arranged, and easy to maintain and ... used in petroleum exploration,that is to use the cat head.Main Specifications:(φ114mm)Drilling depth (φ89mm) (φ73mm)(m) ... , oil drilling and mining rubber parts and other rubber products. The material of these products are NBR, NR, EPDM, FKM, ...