Screw

Screw

Screw

  Screws common in mechanical, electrical and buildings, and, usually metal, cylindrical barrel, engraved with the embossing surface of the groove, such as a tilted side surface around the screw, so that the screw can be locked with screw cap or other object. Screw the top of the larger diameter, can be round or hexagonal, etc., so that tools such as a screwdriver or wrench to turn the screw. More prominent at the top of Yi Ling screws will not drill too deep and through the material, and increasing the pressure screw on the materials.