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PDC drag drill bit?Drag Bit?PDC drag bit models and features: Suitable for soft - medium hard formation drilling,Website:http://www.qianruidrill.com, the kinds of bit with high efficient, high impact resistance, high abrasion resistance, can be used for deep drilling in complex formations; high quality PDC inserts, advanced welding technology, multiple precise heat treatment. Widely used in geological exploration, coal mining, mining, water, utilities and other industries rock drilling. Alloy drag bit fea:  Highest penetration rate,maximum wear resistance,longest lifespan in rough working con