The product is an emergency release lock. It is made of solid materials. It is safe and durable. It can serve you for a long time without being easily damaged. It is an excellent emergency release lock that can bring you more convenience, allowing you to have a more comfortable experience. Features-Color: As shown-Material: Steel wire, metal-Size: 5.50X5.50X4.00cm/2.16X2.16X1.57in- This door lock allows manual opening of the garage door in case of power failure or other opener malfunction.- This garage door emergency release lock is universally compatible with most brands of garage door openers.- Made of die-cast construction, brushed steel wire and metal for durability.- Widely used in banks, hotels, shops, schools, homes, shopping malls, and etc.- Easy installation, easy to use for beginners or professionals, allowing you to use in an orderly and stable manner. Packing list 1 x quick release lock 2 x keys