Based upon our popular Chinook line of tree grates, the Chinook 2000 works from the center tree opening outwards with a pattern of concentric rings that transition into our signature Double Wave pattern. Conforms to ADA Accessibility Guidelines. AVAILABLE MATERIALS: 100% Recycled Grey Iron, Ductile Iron, 100% Recycled Aluminum, Silicon Bronze, Nickel Bronze. AVAILABLE FINISHES: Raw Natural Finish, Rust Conditioner (Grey and Ductile Iron Only), Polyester Powder Coat, Liquid Coat (Available upon request), Brush (Aluminum, Bronze and Nickel Bronze Only), Polish (Aluminum, Bronze and Nickel Bronze Only). The Chinook 2000 is square and comes in 4', 5', 5' (2 pieces), or 8'.