MATERIAL inchIt is made of zinc alloy, sturdy and durable, you can apply it for a long time. SIZE: Total size 72.22*72.33mm.Triangle (Outside diameter 14.31mm, inside length 10.26mm.) Circle (Outsider 15.30*9.20mm, 5.60mm inner diameter.) Large Square (Outside diameter 12.10mm, inside 6.11*6.13mm. ) Small Square (Outside diameter 14.31mm, inside 8.32*8.32mm.) APPLICATION: Multi-function keys can serve as a convenient wrench and turn screws, suitable for many valves of electricity, water, gas, train, cabinet, elevator, etc. FUNCTION: The service meter key has 4 shapes, including 2 square shapes, 1 triangle and 1 circle shown in the picture, functional and can be applied as a function of size and shape. COMPATIBLE: Can be used with water, electric and gas service cabinets, becoming a real handy key wrench. Delivery Quantity: 1 Piece