Case of 5 KERAMIK Drill Bits - No. 151 250 410 The KERAMIK Drill Bit has an extremely hard and sharp carbide tip, diamond ground from Tungsten - Titanium, with a hardness grade of 9. Low stress high temperature brazing at 1120 degrees Celsius prevents detaching of carbide tip when drilling extremely dense materials under most extreme loads. Depending on the hardness and density of the tile, the KERAMIK drill bit will last from at least 10 to approx. 100 drill holes. KERAMIK comes in a set of 5 drill bits, from size 5/32" to 3/8", was developed in Germany by KEIL
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