Counterbore 5/16" w/ 1/4" pilot for LARGE CORBYS

Counterbore

• 5/16" with 1/4" pilot
• 2 part construction
• High Speed Steel

These counterbores fit our large Corby bolts perfectly.

Tip: How to use these for our Large Corby Bolts
Locate and drill the holes into your scale using a 1/4" drill bit. Then, using the counterbores, drill down into the same holes. The smooth pilot fits perfectly inside of the already drilled hole. The flutes will make the hole just a little wider and the bottom of the hole will be flat. Drill down with the countersink about half the thickness of your scale. Screw in your corby bolt and cut, then grind off the excess length. I would suggest you also epoxy your scales but the mechanical lock provided by the corby bolts ensures your handle scales aren't going anywhere...