The diamond drill bit (crown) with a diameter of 12 mm on ceramic granite, granite, marble and a ceramic tile of the GRAFF Standard series is quality-to-price ratio for work at home. Drill bits have a cylindrical shank for use with a drill or screwdriver. The height of the cutting part with high-quality diamond grain is 5 mm. Drills up to 14 mm diameter inclusive contain solid lubricant that cools the drill during operation, drill bits with 16 mm and 18 mm diameter are supplied without solid lubricant.
To facilitate the operation it is necessary to start drilling at an angle of 45 degrees and then gradually bring a drill bit into a vertical position. In order to avoid overheating which may cause tool breakage, the working number of drill bit revolutions with 12 mm diameter should not exceed 800 rpm.
Drill bit size is 12.0 x 65 x 5 mm, where 12.0 mm is the diameter of the drill, 65 mm is its total length, 5 mm is the height of the cutting head.
This type of diamond crown drill bits is used for dry drilling ceramic granite and tile only in shock-free mode.