It is simply not necessary with our patented Vitralase® and Vitrix® laser engraving processes. In fact, depth is a disadvantage. To explain: Depth has been defined as durability, not so. The very element that creates breakdown is depth. Deep engraving contributes towards weakening and can void the brick of its strength. Over a period of time or simply at the time of installation, the small projected pieces of the characters are subject to chipping or breaking away. This causes the letters to be illegible. Environmental debris (sand, food, etc.) falls within the deep engraving, in turn, causing a maintenance problem.