ITW Buildex 1/4-14 x 1" Hex Washer Head - Composite Material to Steel Teks Select 3 Self-Drilling Screws (2500 per box)ITW Buildex Tek Screws Part #1119000 Teks Drill Point Non walking, cutting edges, pigtail reduction Engages material faster, drills with less effort, safer installation Load bearing area Selectively hardened to retain strength and ductility performance similar to a Grade 5 bolt Resists shear failure due to loading and different expansion coefficients in dissimilar metals Installs faster Drills and taps faster with fewer stalls Reduces installation