Set - Contains 3 different sizes of white pipe protectors, and 8 pieces of each size, for a total of 24 pieces. .Dimensions - The hole diameters of the 3 pipe protectors are 16 mm, 20 mm and 25 mm respectively. .Material - These heating pipe protectors are made of high-quality plastic, have excellent heat resistance, good toughness, corrosion resistance and are very durable. .Easy to install - This plastic pipe collar is very easy to install, simple and generous, and can beautify, cover and block the holes in the pipe. .Usage - This plastic pipe protector collar is suitable for all kinds of pipes, such as heating pipes, water pipes, gas pipes, angle valves, faucets, radiators, drain pipes, etc. .