These keys are made of zinc alloy with good quality, lightweight and easily carried, easy to use. The key can be opened to the door and window of the train, car, elevator, subway, electronic control cabinet, electric meter box, marine business, meter keys (magnetic) category. Features - Color: Silver.- Material: Zinc alloy.- Size: 8.40X4.50X0.80cm or 3.30X1.77X0.31 inch.- Made of zinc alloy and with color of paint for metal, sturdy and durable.- The product designed is very compact, easy for you to store and carry around.- Lightweight design, exquisite appearance, and easy to use, it is a very convenient and practical product in your daily life.- This set includes most styles of keys for daily electricity, cabinet and faucet demands, practical sets and must-have items for meeting your daily demands.- Fine workmanship and creative appearance ensure its popularity and practicality.Packing list: 4 x keys