12-14 x 3 6-Lobe Flat Self Drilling Screw Fully Threaded Zinc & Bake M20-1.50 It has a hexagonal shape

It has a hexagonal shape with a 3/16 inch outside diameter and a 1/16 inch thickness

The 1/4-28 NE Nylon Insert Hex Lock Nut Black Oxide is a high-quality fastener designed to provide a secure and reliable connection in a wide range of applications

The 7/16-14 x 3 3/4 Hex Cap Screw Grade 5 Zinc USA is a high-quality fastener designed for use in a variety of applications

5/8-11 x 4 Carriage Bolt Grade 8 Fully Threaded Plain is an industrial fastener designed for heavy-duty applications

12-14 x 3 6-Lobe Flat Self Drilling Screw Fully Threaded Zinc & Bake M20-1.50 It has a hexagonal shapeThese 12 14 x 3 self drilling screws are designed for fast and easy installation into metal. They feature a 6 lobe drive that provides superior grip and reduces cam out, and a fully threaded design that ensures a secure hold. The zinc and bake coating provides excellent corrosion resistance, making them ideal for both indoor and outdoor applications. These screws are perfect for a wide range of projects, including metal framing, roofing, and siding.