20' Cobra Rolled Ridge Vent Low profile fiber mat permits maximum airflow yet prevents water and insect infestation. 3/4 lowest profile in the industry. No fabric overwrap or filters to clog or deteriorate. Flexible, easy to handle. Conforms to roof pitches from 2/12 to 20/12. 40 year limited warranty. Includes 2-1/2 roofing nails. Cobra hand nailable ridge vent net free area 16.9 sq. in./linear ft. Cobra gun nailable ridge vent net free area 14.1 sq. in./linear ft. Model No GAFCB10520 Size 10.5 x 20', Thickness 3/4 , Type Hand Nail, Color Black, Net Free Area 16.9 sq. in./linear ft. Pkg Qty 1 Package Type Sleeve Size 10.5 x 20', Thickness 3/4 , Type Hand Nail, Color Black, Net Free Area 16.9 sq in per linear ft, Roof Pitch Size 2/12 to 20/12, Pkg Qty 1, Package Type Sleeve