TAPS TYPE MAS (SPECIAL OPERATIONAL TAP)
Capture and subsequent removal out of the well the left drilling string with sleeve ending by screwing into sleeve thread
Taper taps are used for catching a fish when pipe broke on thicker end. Taper tap consists of box thread on upper end, taper body and threaded wicker on lower end. Wicker has a form of flattened cone and has vertical chip grooves.