#8 countersink is a 7/64" drill with a countersink diameter of 5/16. This would use a 5/16 plug cutter.
The Montana Brand 4-in-1 Drill & Driver provides versatility and ease-of-use for do-it-yourself tasks and professional construction projects. Drill, countersink or counterbore, then release the locking collar, flip the modular insert and drive the screw. Precision made for drilling accuracy and high-torque driving applications. Get jobs done easier, faster and with professional results. Also a great woodworking tool and companion set with the Montana Brand Self-Centering Plug Cutters.
Multi-function modular design
Compact size for improved use and maneuverability
Modular insert with rare earth neo magnet
Locking collar secures tool
1/4" Non-slip impact hex shank
Strong fastener retention
Fast and easy drilling and driver functions without re-chucking
Change from drill to drive mode with one hand
Patented Montana Brand on-board hex key allows drill bit, countersink and driver bit changes
Magnetic driver bit tip provides a strong fastener retention
Works with all electric and battery powered drill/driver brands
Montana Brand tools are manufactured utilizing high quality materials for durability and long tool life
Made in the USA