Even among contractors, who use screws everyday, there is often confusion as to why there are different numbers assigned to drill bit tips on tek screws. Self drilling screws,sometimes called tek screws, are self tapping ...

The Round Washer Head design, which can also be known as wafer head screws, K-Lathe screws and modified truss screws, could quite possibly be the most multipurpose head design offered. It combines the benefits of ...