Excel Impex brings you 102 mm Long Core Drill bit made of high quality diamond segments with precision drilling speed and long life use. Best for making holes on marble, granite, concrete, ceramics and a number of hard and brittle materials. Used by professionals to do a quick cut into concrete with laser welded segments that contain a high concentration of top quality diamonds. This, combined with a special blend of metal powders, will help to deliver extremely fast cutting and long life in a variety of materials including concrete, cured concrete with heavy reinforcement and hard masonry materials. The newly designed segments penetrate quickly and hold a straight drilling path to reduce side drag, and also increases water flow to reduce heat and remove slurry more efficiently. Method of Use: Use Wet or Dry. To prolong its using life, must use with water for cooling and lubrication. It can be used in many applications including plumbing, masonry for pipes or manholes and drilling into concrete among many more.