AN UNBIASED VIEW OF TYPES OF SCREW HEADS

A double-square screw head is usually applied on industrial-stage models and haulmark trailers. A bulged head, in some cases having a black phosphate coating. Great for attaching drywall to the steel stud or timber. Slotted- slotted drive screws are really typically employed and straightforward to find. The slotted recess contains a straight line