8-15 x 3 1/2 Phillips Pan Self Tapping Screw Type A Fully Threaded Zinc WS316 which means that they can

which means that they can be used to fasten materials of different thicknesses

This 2-56 x 5/32 Phillips flat machine screw is fully threaded and made of 18-8 stainless steel with a black oxide finish

This lock washer is commonly used in construction

Its 1/4-20 thread pitch provides a secure hold

The nut has a nylon insert that grips the bolt or screw

8-15 x 3 1/2 Phillips Pan Self Tapping Screw Type A Fully Threaded Zinc WS316 which means that they canThese 8 15 x 3 1 2 Phillips Pan Self Tapping Screw Type A Fully Threaded Zinc screws are designed for use in metal, plastic, and wood applications. They have a Phillips pan head with a self tapping point that eliminates the need for pre drilling. The screws are fully threaded for maximum holding power and are zinc plated for corrosion resistance. They are available in a variety of lengths and diameters to meet your specific needs.