Our Diamond Max™ 1-3/8" Hole Saw Bit delivers up to 20X longer life with unmatched cuts in porcelain. Diamond Max™ Hole Saws offer best-in-class performance with higher-grade diamonds and superior retention. Features Maximum wear resistance to tackle the most demanding applications. The improved diamond grit delivers faster cutting and quickly grips into material for clean, easy cuts. Designed for more cutting with less clogging.