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

This screw is zinc plated for 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

it features a zinc yellow chromate finish for enhanced corrosion resistance

Its flat design provides a smooth surface for even load distribution

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.