Reverse Counterbore: 1-1/4" Dia, 3/8" Pilot Hole, 4 Flutes, High Speed Steel MPN:190-12J

The reverse counterbore is a specialized cutting tool used by professional machinists or fabricators for precise porting and hole deburring operations after threaded insert installation requiring both external and internal dimensions alignment providing clean finishing touches necessary before surface treatments making it suitable for automotive engines, medical implant production among others. Its 1-1/4 diameter offers ample coverage while its 3/8 pilot hole enables perfect centering on workpieces during drilling preventing deviations ensuring concentricity requirements are met thus delivering precise results consistently. The four flutes enhance chip evacuation minimizing heat build-up resulting in longer life span of the tool without premature wear and tear prolonging usage periods significantly thus offering cost efficiency while adhering to stringent quality control standards needed by industries demanding perfection ultimately assuring customer satisfaction with finished products exceeding expectations meeting their requirements accordingly.