A shelf peg I made on tinkercad in about 5 minutes. The diameter of the original cylinder is approximately .243". The original peg that I patterned this one from is out of an old curio cabinet / hutch and is used to hold up a glass shelf. The hutch is at least 40 years old and the original plastic pegs have become brittle. Even though it is indoors, I recommend printing it in a durable filament since it will be weight bearing.