The smart Trick of types of screw heads That Nobody is Discussing
A bulged head, occasionally which has a black phosphate coating. perfect for attaching drywall into a metal stud or timber. Europeans Have a very historical past of affixing two objects with each other employing metal screws For the reason that fifteenth century, and the 1st screw-cutting lathe was invented in the 1700s by Jesse Ramsden, an instru