The KNAACK® STORAGEMASTER® Flat Top Boxes offer the same industry-leading protection as other STORAGEMASTER Chests, but with a unique folding "piano hinge" door that opens to allow easier access to all tools. As one of the most versatile storage solutions available, these boxes offer up to 57.5 cubic feet of space. One model even features a ramp for roll-up access, affording greater storage flexibility on the jobsite. KNAACK STORAGEMASTER Flat Top Boxes keep you protected with the WATCHMAN® IV Lock System, the strongest single deadbolt-style locking mechanism. Heavy-duty 16-gauge steel body construction and fully arc-welded seams provides durable security all day and all night long.