Universal Pipe Compatibility: The clamps fit a wide range of copper pipe sizes used in air conditioning systems, making it suitable for various HVAC installation and repair tasks. Made of high-quality materials for maximum durability and reliability. Construction: Made with high-quality metal and sturdy components, this stabilizer is built to withstand repeated use and high temperatures from welding torches. Anti-Shake Welding Support: The adjustable clamps firmly secure copper pipes, preventing movement during welding for cleaner, more reliable joints. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need., Manufacturer: Aundhegrtt