These combination tools in TCT can be used in abrasive materials.
They will drill, countersink and finally counterbore a parallel hole.
Designed to receive plug maker group 24.
The drill diameter sizes are for a clearance hole only.
For use with drilling machines or routers.

T.C.T.
1/4in Shank.
Woodscrew Size. No.10.
Drill Diameter 7/32in.
Countersink Diameter. 12mm.
Drill Length. 20mm.