High-quality material: The fixing screws and wrenches are made of stainless steel, which is rust-free, pollution-free and durable. Product function: The adjusting screw passes through the threaded hole of the external object, close to the internal object, preventing it from moving relative to the external object. It applies a compressive or clamping force through a lower tip that protrudes from the hole. Package contains: 25 x fixing screws, 1 x hex wrench.