High speed steel counterbores are used in
knifemaking to counterbore bolsters for pivot pins on folder blades and
countersink the pivot pin screw heads. Counterbores are designed to cut
steel, aluminum, titanium, and other metals. Can also be used on wood,
Micarta, G10, and other handle materials to countersink the handle
fastener. Counterbores and pilots are sold separately to mix and match
for the pivot pin size needed for your project.