Used to countersink and counterbore for heads of screws in woods, plastics, and non-ferrous materials. Heat-treated for long tool life. The countersink is held in place with two hex-socket screws and is easily adjustable up and down the drill so only one countersink and length of drill is required for one screw size.

• Cutting Diameter: 5/16"
  
• Drill Hole Size: 7/64
  
• Overall Length: 7/8"
  
• NBH Number: 12680
  
• Item Number: FUL C4