Covington's Platinum Series Resin Bonded Diamond Blades are an excellent choice for cutting pyrex, glass, ceramic, milli chips and other materials where heat generation must be kept to a minimum. These 1/4" depth super-heavy diamond concentration blades give a smooth, cleaner cut than most plated blades can. These blades are commonly used by glass artists worldwide and are exceptional for cutting glass tube, bar, and rods.