Heat treated tool steel countersinks with a HSS drill. Adjustable for different length screws and can produce a 9.5mm (3/8 inch) diameter or 12.7 mm (1/2 inch diameter counterbored hole for woodplugs. The drill produce pilot holes only.


Dimensions:
Shank Diameter=1/4 inch hex


Shank Diameter: 1/4 hex

(Stock photo not TCT SET)