10-16 x 3 1/2 Square Drive Flat Head Fully Threaded Self Drilling Screw Zinc & Bake M20-1.50 Its 1/2-inch across flats design

Its 1/2-inch across flats design provides a secure grip

this hex cap screw is an excellent choice for construction

Its fine thread design provides a strong grip and prevents loosening

They feature a partially threaded design with a 6" thread length

10-16 x 3 1/2 Square Drive Flat Head Fully Threaded Self Drilling Screw Zinc & Bake M20-1.50 Its 1/2-inch across flats designThese 10 16 x 3 1 2" Square Drive Flat Head Fully Threaded Self Drilling Screws are made of zinc and bake, making them ideal for use in a variety of applications. The square drive head provides a secure grip, while the flat head sits flush with the surface of the material. The fully threaded design ensures a strong hold, and the self drilling tip eliminates the need for pre drilling. These screws are perfect for use in metal, wood, and plastic.