Clear finish for a stylish look. Made of steel and clear PVC, which is durable and sturdy, not easy to wear and tear, so it has a long lifespan. 5 mm in diameter of this shelf holders pegs. Your hole should be equal to or slightly smaller than the diameter shown (less than or equal to 5 mm)for making dowel pins a tight fit. Convenient to use: easy to install, good to fit, just use your hands without other tools, you can have a relaxing installation experience Clear color is not easy to be noticed and prevent shelf wobble, it make the board sturdy enough to keep level and stable.