Screw with a small diameter head suitable for fixing the locks and counterplates of doors.
which enables the use of a screw with a larger diameter (3.5) that guarantees greater strength without the head projecting out of its housing.
CARBONITRIDING HEAT TREATMENT
More info: heat treatment
The Nickel plating treatment, with its shiny appearance, ensures better coupling with the hardware elements to be fixed.
More info: finishing treatments