This product is an emergency release lock. It is made of solid materials. It is safe and durable. It serve you for a long time without being easily damaged. It is an excellent emergency release lock that bring you more convenience, allowing you to have comfortable experience. Features -Color:Silver -Material:Steel wire, metal -Size:5.50X5.50X4.00cm/2.16X2.16X1.57in - This door lock allows manual opening of the garage door in the event of a power failure or other opener failure. - 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 bank, hotel, store, school, home, mall, and etc. - Simple installation, easy to use for beginner or professional, allow you to use in an orderly and . Package list: 1 release lock 2 x keys