These towel holders work wonderfully without drilling. Took hours but finally mounted. I bought them for my 4 year old granddaughter. Below the disk the base is cut in such a way that it can only mated to the handle bar strap in one way. It didnt hold my foot in. I love the lulu crossover I own several pair. Forced to spend time together during a security blip in the course of a public event, the two boys, so different from each other, find that they actually share a lot?mostly the annoyance of being dragged into their parents? presidential aspirations during their senior years in high school. I could have easily worn the 40 and she could have worn a 39. PLEASE don?t hesitate to buy these! I decided to give them a try because Amazon has a great return policy.