Abstract: A utility tray having multiple compartments for retention of items such as nails, screws, washers and other small parts; and a pivoted lid to cover a single array of compartments, an upper mounting plate attached to the floor of the tray and a lower mounting plate facilitates mounting and demounting the tray and upper mounting plate to and from the uppermost platform of a foldable step ladder. The tray has bores that accept swiveling typecastor wheels that convert the tray into a wheeled, low profile tool and small parts retainer convenient for use in making under vehicle repairs or for use by tradesmen in home construction and remodeling.