'New York Central' prototype. Overall outside dimension: 5" W x 5" H x 3/4" thick. Vault: 3-3/4" high x 2-1/2" wide NEW YORK CENTRAL SYSTEM is an integrated system of matching wall, portals & Scale Masonry components: FL4169-HO Single NYC Block Portal FL4270-HO Double NYC Block Portal FL4210-HO NYC Block Retaining Wings set