SQUARE POST SHELVING STARTER & ADD-ON UNITS SQUARE POST SHELVING STARTER UNITS Includes 4 Shelves and 4 Posts SHELVING ADD-ON UNITS Includes 4 Shelves, 2 Posts and 8 S-Hooks. Product No.   HS183672ZA-4 Size D x W x H   18 x 36 x 72" Wt. (lbs.)   54 Price Ea.   $183.86 Quantity: