Review on Durable Precision Diamond Granite Porcelain Electroplated: Superior Quality for Lasting Shine! by Timothy Louis

I was very pleased with the performance and quality of these Diamond Dusting Bits. I only needed the 1-3/16" and 1-3/8" sizes for my bathroom renovation project. I used them to drill through the cement board and tile for my tub spout and valve handles. I also used a 1-5/8" hole saw to make a 5" round hole in my shower valve tile by drilling a few overlapping circles. I solved the problem of not having a center cutter guide by drilling slightly larger holes in 1/2" pieces of plywood and using them to hold the cutter where I wanted it. I attached a plywood guide to the tile and then poured some water into the guide block to keep the hole saw bits cool. There were other kits that were a bit cheaper but this one came with a very nice foam lined case to keep the beats organized.