The Quik-Pik Wrench Racks organizes wrenches while the clear labeling makes sizes easy to grab and go. The empty slots quickly show which wrenches are missing. The patented spring tabs in each slot keep wrenches in place. Its low profile and fits 2-inch deep toolbox drawers. It has a molded in carry handle and is made of tough polypropylene plastic. lifetime Warranty and is made in the USA. The size of the holder is 6-1/4″ x 1-3/8″ x 12-5/8″. The set includes #5301 Red Sae Wrench Tray Holds Sizes: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16", 1″. #5302 Grey Metric Wrench Tray Holds Sizes: Holds 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18mm.