Description
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.
Gulso Bolts-
1/4" uses Counterbore #CB2 with Pilot #PIL5