One And Five Eighths Carbide Tipped Counterbore Drill Bit Pro Grade Four Flute Seven Sixteenths Pilot Hole One And A Quarter Shank Two And A Quarter Flute Length Eight Inch Overall Length New Old Stock

Carbide Tipped Counterbore Drill Bit, 1-5/8 CB, NOS
✔️ 1-5/8" carbide tipped counterbore, 7/16" pilot, 1-1/4" shank, 2-1/4" flute, 8" OAL

This carbide tipped counterbore drill bit is designed to create flush, accurate recesses for bolt heads in metalworking and woodworking projects. It is typically used in drill presses or handheld drills to prepare counterbores with a precise 7/16 inch pilot and a 1-5/8 inch counterbore, delivering clean, square seats.

✅ Carbide tipped for longer life on metal and hardwood
✅ Four flute design for efficient chip clearance and straight holes
✅ 1-1/4" shank fits standard drill chucks and holders
✅ 2-1/4" flute length for deeper counterbores
✅ 7/16" pilot hole for common bolt sizes

💡 What is a counterbore drill bit used for in bolt head recess prep? This handy tool helps create a flat-bottom seating area for bolt heads. - how to select counterbore size for bolt head seating in metal and wood - benefits of carbide tipped counterbore bits for hard materials - drill press compatibility and choosing shank sizes and pilot sizes