A screw is any type of fastener with a thread, in helical form, wrapped around a cylinder. Screws are designed to penetrate materials and provide holding by threading into material. Unlike nails, screws possess better holding power because of their geometry and hence are widely used in situations where accuracy and permanency are needed. Therefore, this makes the screw a very basic co... https://www.dalloyedbolts.com/screw-manufacturers-suppliers-stockists-exporters.html