Also known as pig nose or twin gap, this screw head has two round holes that are reverse each other and resemble a pig’s nose. It is a stability-type screw to forestall tampering. You will want a Unique spanner screwdriver for this type of screw head. Binding screws are two-element https://johnathanmxfls.bloginder.com/29983457/types-of-screw-heads-uk-options