LITTLE KNOWN FACTS ABOUT TYPES OF SCREW HEADS.

A double-square screw head is usually employed on industrial-amount types as well as haulmark trailers. this information was current along side AI know-how, then simple fact-checked and edited by a HowStuffWorks editor. comparable to the Philips screw head in that it's a four-arm cross center, the torq-set screw head does have some differences. T