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Xi'an Tydrillbits Co.,Ltd is one of the most famous China carbide drag bit manufacturers, welcome to wholesale cheap carbide drag bit from our factory.The Drag Bits can penetrate softer formations such as stiff clays and Mudstones very quickly.  Usually used for construction or other site investigation projects. It has two types, Step Type and Chevron Type. Our can design the special size per customers' requirements.The Drag Bits advantages：1，Low price2，Long life3，Carbide and alloy material is high4，Wear resistance, longer service life and higher efficiency.Product Description of Alloy Drag Bits:Alloy non-core bits mainly used for drilling of soft and medium formation, also widely used for geology, coalfield, metallurgy, building, mining, project survey, rail, bridges, housing.Application of Alloy Drag Bits :These bits are used in penetrate the degassing hole, drain hole,and grouting hole of coal mine. Or used for the purpose of geology, coalfield, metallurgy, building, mining, project survey, rail, bridges, housing.Drag bit size and connection thread Diameter(inch)Connection pin typeStep type2 7/8 inchAW rodY3 1/2 inchNW rodY3 4/3 inch2 3/8 API REGY4 3/4 inch2 3/8 API REGY5 inch2 3/8 API REGY5 1/8 inch2 3/8 API REGY5 3/4 inch3 1/2 API REGY6 inch3 1/2 API REGY6 3/4 inch3 1/2 API REGY7 inch 4 1/2 API REGY7 1/2 inch4 1/2 API REGY8 inch4 1/2 API REGYSize to 22 inch available -ask for the detail 4 1/2 API REGY