Diamond Hand Profiler V Type Shape Vaccum Brazed Profile Wheel Metal Cover Router Bit For Marble Granite Desktop 5/8-11 Thread,The profile wheel internal water holes are designed for continuous water flow to keep slab stone counter edges continuously cool wet and lubricated while grinding. Wheels top circular guide is designed to regulate longitudinal and lateral movement of wheel and provides greater flexibility and control on profile depth and width. The profile is built with vacuum brazed technology known for stronger bonds, wear resistance and durability.