Allgrip 1/2 BZ Self Tapping Screw No.10 x 1in, CSK Pozi, supplied in a pack of 100.
Self tapping screws cut their own thread in pre-drilled sheet metal, plastic and thin section steel. Used for fixing panels, brackets, trims and enclosures.
Drill a pilot hole to the recommended size for the gauge and drive with a Pozi or slotted screwdriver.