Mushroom Head Umbrella Nails Smooth Shank, Roofing Nails Iron Whire Galvanized Size 6G, 7G, 8G, 10G, 12G Length from 1 inch up to 4 inch Surface Treatment: hot dipper galvanizing and white zinc plated 1. Surface Treatment: Bright, Electical Galvanized; HDG, Color Zinc 2. Available: Smooth shank; Twist shank; 3.Roofing nails with umbrella head: 1" to 4" ( Length is from the point to the underside of the head. ) 4.Regular Size BWG8 up to BWG12 5.Packing: 25 kgs carton, or 30kgs/35kgs/48kgs wooden box