FSO-T window-starting mill with combined reinforcement is used to run in and set whipstock on the bottom and to mill window in a cased hole, all in a single trip.
It can be used:
Having helix angle, FSO-T window-starting mill dressed with crushed tungsten carbide and carbide inserts.
The mill is used in extreme environment (double casing, high-grade steel casing (i.e. R-110) and for heavy-wall casing.