Also known as countersunk, flat head screws have a tapered underside that lies flush with the fabric it can be pushed into. Flat head screws need a countersunk gap Unless of course the material is incredibly tender. Having said that, They can be different. A bolt is often a form https://typesofshingle71470.blogdemls.com/29163156/fascination-about-types-of-screw-heads-pdf-free-download