Maxdrill ST58 Ballistic Bit 1.Part No. 3089ST5814D 2.Bit Diameter:89mm 3.Thread: ST58 4.Button Bits: 14 Buttons 5.Length of drill rod: 1800mm-5530mm 6.Button bit design: Flat face, drop center, normal and retrac body. 7.Tungsten carbide (Buttons): Spherical, ballistic and conical. 8.Applications: Drifting, tunneling, bench
