It will be TPMR inserts, not TMPR. All those letters identify is the shape and style of tool and inserts.
Depends on the grade and shape of insert really, the tool type and shape is good for a number of general purpose turning tasks, but the inserts themselves will determine the material and cutting parameters.
Bit uncommon to see that style of tool without a hole in the insert for fixing, but again, depends on the insert design and grade