The various types of screws that can be manufactured, such as a cap screw, setscrew with hollow head, machine screw with oval head, machine screw with Philips head, flat-head wood screw, lag screw, self-tapping screw, and others.
DADOS FORNECIDOS PELA ESCO (COMISSÃO EUROPEIA) E O*NET (DEPARTAMENTO DO TRABALHO DOS EUA)