Material: Each set includes 3 high quality cross-shaped zinc alloy keys, using electroplating process, never rust, durable, can be used for a long time. Anyone who works with control cabinets needs it. There are 4 shapes of ammeter keys, 2 square, 1 triangle and 1 key shape as shown in the picture. They have full functions and can be used depending on size and shape. Suitable for air conditioners, electric vehicles, cars, elevators, etc. Size: As the pictures show, it is convenient for you to carry it or put it in your bag. There is a hole in the middle of the wrench, which can be hung on the key ring for easy carrying. Wide range of uses: the multi-function wrench can be used as a handy wrench and turning screw, suitable for many electric valves, water, gas, trains, cupboards, elevators, etc.