The Master Lock 5401D 5-Key Locking Combination Steel Box is a large, portable lock box made of steel with a diameter of 4 inches. It features a combination lock mechanism with a keypad, offering security rating A and B. The box is surface mounted and has dimensions of 12 inches in length, 6 inches in height, and 4 inches in depth. With a sleek silver and black color scheme and a weight of 1.09 lbs, this lock box is perfect for key storage and security in your home or garden.