Features: Our multilayered cone reamer provide efficient and accurate hole expansion. Three sizes available for quick and precise hole enlargement, improving work efficiency. Crafted with diamond materials, our cone reamer ensures reliability. Its multilayered design allows gradual hole enlargement, suitable for different materials. Suitable for worker, technicians, and enthusiasts in the machinings industry, our cone reamer caters to a wide range of users. Perfect for those seeking hole expansion tool. From concrete to tile, marble, and engineered stone, our cone reamer is practical for drilling hole in various materials. Perfect for different drilling projects. Upgraded your drilling experience with our multilayered cone reamer. Say goodbye to manual hole enlargement and embrace the efficiency and accuracy offered by our tool. Specifications: Material:Diamond Diameter:20mm/0.79'',35mm/1.38'',50mm/1.97'' Height:12mm/0.47'' Thread:3/8" Package Includes: 1Piece Step Drill Bit note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.