material: metal colour: A: [22 tube diameter] 53-80CM, B: [22 tube diameter] 70-120CM, C: [22 tube diameter] 85-150CM, G: [25 tube diameter] 53-80CM, H: [25 diameter] 70-120CM, I: [25 diameter] 85-150CM, M: [32 diameter] 85-150CM, installation steps: 1: Both ends of the brace _ upper floor, screw the fine adjustment nut to a fixed position, do not be too tight 2: Extend the lever to the length of use, left hand is not moving, right hand is tightened clockwise Fine-tuning device 3: Without moving your left hand, properly adjust the fine-tuning device and tighten it to make the bottom plate close to the wall. 4: Double-check whether the poles are parallel and firm, close to the wall, and the installation is complete