There is no key but safety latch prevents the lid from opening, even when the box is unlocked.The STEELMASTER® Box is a compact box perfect for concealing documents or petty cash— at home or work. A piano-hinge lid opens to reveal all contents. Tough heavy-gauge steel construction. Can hold a variety of essential items. 4 1/2"H x 10 1/4"W x 7 1/4"D