With thread depths of 1.5 x D and 2 x D, respectively, Walter Prototyp Supreme TC610 and TC611 offer geometry that minimizes vibration while producing optimal surface finishes, and through coolant design that maximizes chip removal and helps prevent fractures. WB10RD grade, providing optimized wear resistance, features TiALN coating with finishing layer of ZrN. WJ30RC grade, with TiALN coating, can be run with or without coolant, broadening areas of application.