Hillman 5 16 18 x 4 in. Stainless Steel Hex Head Cap Screws (25 Pack) Flush Stair Nose EcoBatt R 13 Unfaced Fiberglass Batt Item Weight:.625 EcoBatt R 13 Unfaced Fiberglass Batt Insulation The small cupped head is designed to be driven flush or slightly countersunk for putty fill and a clean look Specification Details Brand Hillman Type Hex head cap screw Diameter Thread 5 16 18 Length 4 in Material 18 8 Stainless Steel Finish Stainless Steel Thread Type Coarse Shank USS partially threaded Head Style Hex cap with washer face under head Pieces per Pack 25 Packaging Type Boxed Installation Use with wrench or driver A: 5 16 18 coarse thread