Grip Rite 40D 5 in. Common Hot Dipped Galvanized Steel Nail, Flat Head, 50 lb Rubber Tile The design and checkered head Item Weight:.625 The design and checkered head make them easy to countersink for a flush surface Specification Details R Value R 30 Facing Unfaced Thickness 10 in Width 24 in Length 48 in Coverage 88 sq ft per package Technology ECOSE Technology (formaldehyde free binder) Brand Knauf Insulation Product Type Fiberglass insulation batt Frequently Asked Questions (FAQ): Specification Details Material Steel Finish Coating Hot Dipped Galvanized Length 5 in Penny Size 40D Head Type Flat round head Shank Type Smooth Point Type Sharp diamond point Pack Weight 50 lb Intended Use Wood to wood applications 5 inches long