QEP’s Xtreme Series OR Xtreme Wax/Dry 4-Piece Diamond Hole Saw Kit by QEP includes diamond hole saws in 4 sizes: 1/4″, 5/16″, 3/8″ & 1/2″ (6mm, 8mm, 10mm, 12mm) for fast and accurate cutting of porcelain, ceramic and glass tiles. These diamond hole saws are manufactured for use with standard drills , and designed with a superior diamond grit edge for faster and smoother cuts. This kit is Ideal for installation of bathroom accessories and any type of decorative accessory on ceramic surfaces. Wax/Dry, these diamond hole saws do no require constant water flow.