NOT KNOWN FACTUAL STATEMENTS ABOUT TYPES OF SCREW HEADS

Spanner- Spanner drives have two holes in the head on the screw that locks into a screwdriver or drill little bit in the course of set up. This screw is commonly employed in order to avoid tampering. nevertheless, a lot of hex keys can be employed for it. A tri-angle screw head is standard in master locks and some elevators and camping sto