Quality Material: The triangular key is made of zinc alloy, while the silver key ring is made of aluminum alloy, not easy to rust or break, sturdy and durable to use for a long time period The counter key measures approximately 53.6 x 40mm, while the inner triangle measures approximately 9 x 9 x 9mm, compatible with most triangle keyholes please check your device size carefully before purchasing Portable Design: Equipped with a key ring, this triangular socket wrench allows you to attach it to your backpacks, water bottles, etc., making it easier to carry and store for avoid losing it Wide Applications: The triangular meter wrench is used as a wrench to unscrew a variety of valves, such as elevator, gas, electric, radiator and more. Convenient for your daily life Easy to use: The metal key is T-shaped, while the handle is D-shaped, which is useful for you to use your strength and finish your work efficiently