drilling screws (also known as TEK screws) are similar to self piercing
screws but with a "drill bit" style point that creates its own pilot hole.
head styles for zinc plated self drilling screws include: indented hex
washer head, pan head, modified truss head, pancake framing, pan framing,
oval head, flat head, wafer head, bugle head, trim head, and
self drilling screws in the following metals: zinc plated carbon steel,
black phosphate carbon steel, ceramic coated carbon steel (Made in USA), 410
stainless steel, ultra stainless steel, and 18-8 stainless steel.