Steel Self-Drilling Screw， Zinc Plated Finish， Sealing Hex Washer Head With EPDM Washer， Hex Drive， #3 Drill Point， 1/4"-14 Thread Size， 7/8" Length (Pack of 50)<img src="http://ecx.images-amazon.com/images/I/51XwS%2B9QkSL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41zZMA2yYTL.jpg" noproxy>