This was remixed from UncleFrankSays version to hold a different brand of electrical tape which had a different inner diameter. If you read his comments on the serration, it's really only cosmetic as it doesn't function very well because electrical tape doesn't tear well. What is nice about this, however, is that it gives you a place to hold the tape while pulling it until it snaps. This means that most of the stretch is on the dispensed piece and not back on the roll. If nothing else, the feature allows for you to more quickly pull the next piece rather than letting it stick back on the roll. Amazon Link: https://www.amazon.com/Duck-282289-Electrical-4-Inch-Single/dp/B007JSGNVQ?ref_=ast_sto_dp&th=1 Let me know if the comments if there's interest for other dimensions. Depending on feedback, I may make the design parametric within Fusion 360.