This square key is made of zinc alloy with , lightweight and easily carry, easy to use. The key can be opened the heater of the home, office. Professional and practical design, wear resistant and firm, durable and . Features - Color: Silver. - Material: Zinc alloy. - Size: 2.70 x 2.50 x 1.00cm/ 1.06 x 0.98 x 0.39 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 storage and carry around. - Which is strong and durable, its color is silver, which can hardly fade, sturdy and long-last that can provide you with a . - Our key is suitable for most radiators, but it may not suitable for radiator valves of special size, so please confirm the size of the wrench you need before buying. - Lightweight design, appearance, and easy to use, it is a very convenient and practical product in your daily life. Package list: 10 x keys