12 1/4" Goldman rock bit rotary tricone drill steel geological exploration equipment oil well drilling bits 1.The right drill bit for the right job gives tip the advantages of: Reducing the number of times you trip Increased rate of penetration when drilling means more holes faster Straighter holes and Longer bit life Saves you time and money Bits Thread Connections and sizes: Bit size 3 5/8" â?? 4 7/8â?� | Thread 2 3/8 API Bit size 5" â?? 5 5/8" | Thread 2 7/8 API Bit size 5 3/4" â?? 6 3/4" | Thread 3 1/2 API Bit size 7 7/8" â?? 8 3/4" | Thread 4 1/2 API Bit size 9 1/2" â?? 12 1/4" | Thread 6 5/8 API Bit size 9 1/2" â?? 12 1/4" | Thread 6 5/8 API Bit size 12 1/4" â?? 15" | Thread 7 7/8 API The tricone bit is the most versatile drill bit on the market. It is the go to drill bit in most styles of drilling. Whether you are drilling a water well or an oil well,Western drilling tools has the Tri Cone drill bit for you. The Advantages of using a tricone over other drill bits: There is a tri cone suitable for any rock formation. Tri cone bits are versatile and can handle changing formations. Tri cones Are reasonably priced with long life and good rate of drilling. Depending on your application we can provide you with new,re-run or premium oil field quality tricone bits. 2.Product Features Company introduction  Goldman company was built in 2014, over the years by a number of the majority of customers, our company has been in the customer first, quality first, the purpose and dedication to customer service, domestic and foreign customers alike. I long for drilling: drill pipe, drill collars, Elevators, mud, hanging clamp, three-cone tipped, steel tooth bit, model complete, quality assurance, reasonable price.Our company is specializes in drill bits,drill pipe,Mud pump and stabilizers for water well,oil field,construction,geothermal,directional boring and underground foundation work all over the world.Our purpose is to sell the best quality products at the lowest possible price.We are a professional supplier of new and used (rebuilt)drill bits used for oil field,water well.Including tricone bits.PDC bits and drill pipe.Various of model and dimension available.Good condition and reasonable price. 3.Product information  TCI Tricone bits (1) This series tricone bit use Journal bearing. Hardfaced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. The load capacity and seizure resistance of the bearing is greatly improved. (2). O ring seal is made of the more wear resistance high saturated buna-N with the increased seal section and precisely designed sealing flange in the cone sealing area increased the reliability of the seal. (3). The bit bearing can be ball locked