WHAT DOES KINDS OF SCREW HEADS MEAN?

Yankee Screwdriver: Rather than applying ball bearings, this screwdriver employs a spring-loaded mechanism. In place of twisting the screw along with your wrist, you area the screw head in opposition to the screw and force it to tighten.The name has many variants, which include cap head screw, cap screw socket head, socket head cap screw and cap he