searched the internet for HD and found them expensive. Read Revain reviews and get tips on cheaper products that are worth checking out. Making a pattern out of a 1/8 inch layer was the best idea. I glued it to my tiles, set it to the correct position (the critical pitch in my case), poured some cold tap water into the sink and used a slow speed. on a powerful cordless drill, frequently dip the saw blade in water and use a toothbrush to brush the accumulated dirt from the cutting area many times until I have cut the tile. looks good, more holes can be made if needed. 57mm is obviously not something you will find in kits. I also had to make a 50mm hole and I bought a Tacklife kit for that. He looks better, at least he looks better, but they both did their jobs.