Open Tray Door Storage Units have the highest storage capacity of all our door storage units, making them ideal for storing tall or larger items, including boxed parts. Door trays come in 1, 2 or 3 open tray units to keep items in full view for quick easy access. Two tray units fit doors with handle on the inside (newer Ford and GMC side door, left door). One tray units mount almost anywhere! Tray measures 18"W x 4 1/4"D x 3"H. One-tray unit measures 21"W x 4 1/4"D x 7"H, two-tray unit measures 21"W x 4 1/4"D x 14"H, and three-tray unit measures 21"W x 4 1/4"D x 21"H.