Hillman 372063 Hammer Drive Anchor, 1/4 x 2",100-Pack BF20 they should be placed evenly

they should be placed evenly across the roof

Adjustable metal ring

For skin contact

Heavyweight hickory construction

Cover finish: Gray baked enamel

Hillman 372063 Hammer Drive Anchor, 1/4 x 2",100-Pack BF20 they should be placed evenly"HILLMAN" HAMMER DRIVE ANCHOR 100 Pack, 1 4 x 2", Hammer Drive Anchor, Zinc Alloy Body, Steel Zinc Pin, Drill Size 1 4", Grip Range 3 4" 1 1 4", Minimum Embedment 3 4". Features: Size: 1 4 x 2" Drill Size: 1 4" Grip Range: 3 4" 1 1 4" Minimum Embedment: 3 4" Base Material: Brick, Concrete, Hollow Block Holds Up to (4000 psi Concrete): 325 lbs Zinc alloy body Steel zinc pin Mushroom head Corrosion resistant 100 per pack.