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We manufacture various pdc bit for different drilling application. This type you saw is for drilling oil gas, or geological drilling application. The size is 6’’ 7 1/2’’ 8 1/2’’ 9 1/2’’ 10 1/2’’ 12 1/4’’ 13 1/2’’ 14 1/2’’ 15 1/2’’ 16’’ 17 1/2’’ etc. Your design could be made according to your requirements and it can satisfy different customers’ specific needs. We insist on honesty to provide customers high performance products with competitive price. Welcome for your inquiry.