I'm installing a new toilet and sink in the laundry room to make a utility/semi-bathroom. I had to cut holes for the 3" pipe as well as the waterline and sink drain. Looking for tools for the job, I found Spyder and his set of carbide hole saws. This set is great. The house is old and has several layers on the floor. This tool cuts through ceramic tile, fiberboard, 2ply wood and old vinyl. Ceramic instrument few patients Slightly different material was a no-brainer for this instrument. I am considering replacing my other hole saws with a set of Spyder bi-metal saws.