typically is usually recognized by their blue hue. They’re screwed into pilot holes from the masonry occupation. These screws are typically often called Robertson’s. They have sq. center level which prevent them from stripping out. The threads of a screw tend to be the ridges that spiral up the shank on the screw, which drive it into the fabr

Breakaway head The breakaway head (also called breakoff or shear fastener)[70] is usually a significant-protection fastener whose head breaks off through set up, through or promptly following the driving process, to leave merely a sleek surface. It generally is made of a countersunk flat-head bolt, with a thin shank and hex head protruding from the