Phillips Pan Head Self Drilling screws are made of hardened 410 Stainless Steel and have a sheet metal thread with a self driller cutting (TEK) point to pierce through 20 to 14 gauge metals. The higher the TEK number the larger the drill point to pierce heavier gauge metals. The heads use a Phillips driver #1, #2 or #3 depending on the size of the screw.
Stainless Steel Phillips Pan Head TEK Screws have a self drilling point to aid in the installation of these screws into harder materials. Additionally, these screws are made of hardened 410 Stainless Steel which is harder than the material that is being fastened, easing the installation process, and allowing installation into sheet metal or metal studs.