1/4-14 x 2 1/2 Square Drive Flat Head Fully Threaded Self Drilling Screw Zinc & Bake 8-15 which means that it can

which means that it can be tightened or loosened using a Phillips screwdriver

The six-lobe drive system provides a secure hold and prevents cam-out

With a length of 1/2"

The 5/16-18 Two Way Reversible Hex Lock Nut Zinc And Wax is a versatile and durable nut designed for a wide range of applications

while the hex washer head ensures a secure fit

1/4-14 x 2 1/2 Square Drive Flat Head Fully Threaded Self Drilling Screw Zinc & Bake 8-15 which means that it canThese 1 4 14 x 2 1 2 Square Drive Flat Head Fully Threaded Self Drilling Screws are designed for fast and easy installation into metal. The self drilling tip eliminates the need for pre drilling, saving time and effort. The square drive head provides a secure grip for driving, and the flat head sits flush with the surface for a clean finish. These screws are made from durable zinc plated steel for corrosion resistance and long lasting performance.