Ceramic tile deep hole trimming drill bit set, 10 piece set, 1/4 Hex Shank, 12MM grinding aperture, Grinding length 35mm. Dry Drilling Design: Diamond drill bits built-in wax lubricant that can melt and cool the cutting during dry drilling,you can also use water as an additional coolant to extend the life of the drill bits. technology: brazing process, firmly fixing diamond particles, not easy to fall off, smooth drilling, long service life Wide Application: Diamond hole saw set have wide application,you can use them to drill holes for your ceramic pots,also can use in different hard material such as:,Tile,Glass,Marble,Brick,Stone,etc. Friendly Reminder: In order to improve the service life of the drill,it is recommended to open the small moon pressure groove on the item at a 45 degree Angle during the whole high-speed process, and then slowly erect the drill to 90 degrees Color:Black Material:Metal Package Contents: 10 * Diamond Core Drill Bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.