Mini Drill and Counter Bore

Description

Made to work with Bull Bolts and Mini Corby Bolts.

Drill 3mm
Counter Bore 4mm

The drill is Cobalt and is 3mm

The Counter Bore has four flutes and is made of Silver Steel (also known as Drill Rod) and can be temperature hardened, and then tempered via a heat process to suit it’s required application, resulting in an ability to drill the harder materials like G10 and/or a longer tool life (NOT to be confused with HSS drilling Steels).

We have tested this in our work shop and it makes a brilliant and clean job when using the small bolts that we hold.