Sintered diamond core drills, unlike brazed or plated drills, have diamond content throughout the tip of the drill. The advantages are apparent in the lifespan of the drill, and the speed and efficiency of the drilling. Being different from brazed and plated drills doesn't just stop at the diamond bond though. With sintered drills, it is necessary to have a continuous water feed moving through the center of the drill to prevent both damaging the drill and your work. We offer sintered drills with a belgium hook-up (as pictured above). We also have drills to match your specific water feed assembly. Please call or e-mail for a quote on custom drills or sizes not listed below. WMBE core drills have a 75mm overall length and a 40mm drill depth. Other sizes are also available but require a four week lead time. Please call if you do not see a size here that matches what you require. Drills are measured in mm. To convert inches to mm, multiply inches by 25.4.