Description
Counterbore
High speed steel straight shank
Used for drilling recessed holes into scales for Corby Bolts, Gulso Bolts, screws etc.
Counterbore pilots must be purchased separately.
These also do not come with the allen wrenches needed to set the screw so you will need to supply your own.
Selection Guide:
Corby bolts
3/16" uses Counterbore #CB1 with Pilot #PIL1
1/4" uses Counterbore #CB2 with Pilot #PIL2
5/16" uses Counterbore #CB3 with Pilot #PIL3
Gulso Bolts
1/4" uses Counterbore #CB2 with Pilot #PIL5
5/16" uses Counterbore #CB3 with Pilot #PIL2
3/8" uses Counterbore #CB4 with Pilot #PIL4