THE DEFINITIVE GUIDE TO TYPES OF SCREW HEADS

Quadrex- Quadrex screw drives are a far more one of a kind generate compared to a lot of the choices available. This generate form is a mix of Phillips drives and square recess drives. they may be set up and eliminated with a standard Robertson, Phillips tool, or perhaps a quadrex tool. Frearson screws and Frearson bits are broadly obtainable