This 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, Random Color Lock Cylinder - Material: Steel wire, metal - Size: 5.50 x 5.50 x 4.00 cm / 2.16 x 2.16 x 1.57 in - 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 more - Simple installation, easy to use for beginner or professional, allows you to use in an orderly and stable way Packing list: 1 x quick release lock 2 x keys