Reverse Counterbore: 7/8" Dia, 5/16" Pilot Hole, 4 Flutes, High Speed Steel MPN:190-10K

The reverse counterbore's specialized design allows for quick and easy drilling of countersinks or chamfers creating flat bottom holes preventing edge splintering while improving load bearing strength ensuring smooth, burr-free finishes ideal for machinery components, sheet metal or automotive body repairs. With a 7/8 diameter featuring five pilot hole sizes accommodating applications with various depth requirements, the four flutes deliver fast drilling action cutting through materials quickly while eliminating chipping, thus providing an increase in productivity along with enhanced longevity due to high-speed steel composition ideal for general purpose usage in both professional workshops or DIY enthusiasts seeking superior performance without breaking the bank.