Professional drill bits for dry drilling of all faience, terracotta, granite tiles (super hard) and others. The vacuum-welded diamond seeding with a segment height of 12mm ensures fast and trouble-free drilling. Excellent build quality with a long service life. Grip M14 The drill bits are housed in a luxury aluminum case for storage. Please view all photos. Manufacturer SHDIATOOL The set contains 7 pieces of drill bits with a diameter of 6,8,20,35,45,50,68mm and an M14 angle grinder adapter for a screwdriver. Quality and satisfaction guaranteed