The 1-3/8 inch tile hole saw cuts 10x faster and has 4x longer life, compared to existing premium tile hole saws. Hole saw bitVacuum-brazed diamond core cuts marble, ceramic tile, etc. technology for smoother, cleaner cutsVenting window keeps hole saw cool and gives access to remove debrisAllows the quickest and cleanest cut without using waterExtremely clean cut and finish1/4 in. shankPerfect for plumbing and electrical holes, bathroom installations, audio visual installation and moreHigh quality steel construction1-3/8 in.