Phillips Modified Truss Head Self Drilling Screws feature a Phillips drive and a a sheet metal thread with a self driller cutting (TEK) point to pierce through 20 to 14 gauge metals. Modified Truss Head Screws feature an oversized domed head with a flange, similar to an integral washer. Modified Truss Head Screws have a 100 degree undercut which creates a larger area beneath the screw's head for a larger bearing surface.
Self Drilling Screws in this selection are made from hardened 410 Stainless Steel, to ensure that the metal of the screw is harder than the surface being drilled into. 410 Stainless Steel maintains the corrosion resistant properties of Stainless but is hardened up to approximately 40 Rockwell C.