Lasts up to 10x longer than a Bosch CYL-9 Soft Ceramic Drill Bit Exceptionally durable drill bit tip with Bosch Carbide Technology Hex shank for a strong connection and maximum torque transmission in three-jaw chucks and ¼" internal hex tool holders Ideal for drilling holes in bathroom tiles, e.g. to install a shower partition wall; and drilling in roof tiles, without the need for cooling. Drills comfortably in tiles up to a hardness of PEI 5 Scope of delivery: EXPERT HEX-9 Hard Ceramic Drill Bit, 4 x 90 mm, Manufacturer: Bosch