Industrial quality adjustable countersink for 6 and 7 guage screws from Irwin tools.
Pilot drill is 3/32" (2.4mm) and maximum countersink is 3/8" (9.5mm)
Drives pilot hole and countersink in one operation giving a fully matched screw profile with the length of the pilot being adjustable using the hex wrench supplied.
Hex shank to prevent slipping in chuck and bearing groove for use in quick change adapters.