The QEP Xtreme 1-3/8" wetDRY Diamond Hole Saw is designed to make easy, fast, and accurate cuts in porcelain, ceramic and glass tiles. This hole saw features a special diamond grit edge for faster and smoother cuts, while using less water than conventional diamond drill bits. Simply dip the hole saw into water and drill the desired hole for professional quality and results. 8 Diamond Hole Saws per pack.Ideal for cutting 1-3/8 in. holes in ceramic, porcelain and glass tiles with minimal water useAdvanced metallurgical technology bonds diamond grit to chrome alloy steel base to produce a long lasting cutting edgeExtremely durable and built to last longer than conventional diamond drill bits and standard hole saws12 times longer-lasting than standard hole sawsSide hole for easy plug removal after drillingCan be used to cut in wet or dry cutting conditions, preferred by professional flooring installersEasy to clean by rinsing with hose or in clean water after each use8 Diamond Hole Saws per pack