Tube drills and junk mills are designed for the removal of intrusions and irregularities in damaged pipes or to prepare landings at defective connection points (a typical problem is the build up of beryllium sulphide deposits).

They are also used for drilling out cement from tubing and casing and drilling out drillable packers.

The taper nosed tube dills and concave profile junk mills have a tungsten carbide matrix crown set with natural diamonds over the entire cutting profile.Diamond stone size is adjusted to suit application requirements.