These well proven group CB counterbore sets are supplied complete with an HSS 60 degree slow spiral drill.
Fully adjustable they are each supplied with an Allen Key to secure the drill in position.
The CB counterbores are extensively used for recessing bolt and screw heads.
The TCT version is used for Plywood, particle boards and plastics. (Abrasive).
Type. T.C.T.
Size. 3/8in CB Diameter