Order this PRO-FIT 1 in. (2D) Electro-Galvanized Ring Shank Nails with Plastic Cap for delivery. Coating: Electro galvanized for exterior use to resist rust and corrosion. Code: Made to conform to ASTM F1667. Applications: Designed for use in roofing underlayment, housewrap, insulation. Head Style: Round, 1″ cap anchors housewrap, felt, and sheathing while preventing the nail from punching through the felt or underlayment. Shank Style: Ring shank design keeps the nail from backing out of the wood, offering superior holding power as the wood fills in the crevasse of the rings, creating friction to keep the nail in place over time. Point Type: Diamond point starts fast, piercing felt or underlayment quickly and easily without ripping. Length: Cap nails are 1″.