DescriptionsThose drill bits are made of hard alloy steel， which is widely applied to holes drilling with mables， granites， bricks， tiles and so forth. 3-piece set at a fair price is recommended!<br>Specifications<br>          Model       Size (mm)       Length (mm)           LA111206       6       70           LA111208       8       80           LA111210       10       85   <br><br><br><br>  <br>Materials: hard alloy steelJoints: 7mm diagonal diameter of hex joint fits electric drills and electric screwdrivers.<br>Notes<br> Just fit the bit on an electric hand drill to be ready.<br> Need to add cool water for cooling while operating.<br> To be slow from the beginning and to be steadily slow when about to drill through.Please allow a bit manual measuring errors.<br> Warnings<br> Please wear dust mask and goggle when in process.<br>Package included1 x 6mm Ceramic Drill Bit1 x 8mm Ceramic Drill Bit1 x 10mm Ceramic Drill Bit