8-18 x 1 Phill Full Contour Truss Self Tapping Screw Type AB Fully Thread Zinc BPFB The 4-4 size indicates that

The 4-4 size indicates that the nut has a nominal diameter of 4 inches and a thread size of 4 inches

and other structural components in construction projects

and the black oxide finish offers excellent corrosion resistance

The 12-14 x 1 Phill Full Contour Truss Self Tapping Screw Type AB Fully Thread Zinc is a high-quality screw designed for use in a variety of applications

8-18 x 1 Phill Full Contour Truss Self Tapping Screw Type AB Fully Thread Zinc BPFB The 4-4 size indicates thatThe 8 18 x 1 Phill Full Contour Truss Self Tapping Screw Type AB Fully Thread Zinc is a high quality screw designed for use in a variety of applications. It is made from durable zinc plated steel and features a full contour truss head that provides a secure hold. The self tapping design allows the screw to be easily driven into wood or metal without the need for pre drilling. The screw is also fully threaded, which provides maximum holding power.