Drilling diameter: 12mm / 0.47"; drilling depth: 10mm / 0.39"; shank size: 9.5mm / 0.37". Non-slip triangle shank fits most electric hand drills and bench drills.Applications: Suitable for drilling concrete, masonry, hard brick, marble, stone, and other hard materials.Dry or Wet Drilling: Can be dry or wet drilling. To prolong the using life, it is recommended to be used with water for cooling and lubrication.Large Clearance Hole: Facilitates the entrance of cooling water and the escape of chips and other particles from drilling.Sharp Cutting Edge: The core drill bits cut clean and fast holes, and make drilling process much easier.