Specification:2-1/2" 2-7/8" 3" 3-1/2" 4-1/4" 5-1/4"

Kellies are the drive section of the whole drill stem. The manufacturing of the products refers to the standard of SY/T6509-2000 or API SPEC. 7-1. AISI4145H alloy steel is used in producing the kellys. Kellys'end, drive cross-section and joint are all processed and tested in terms of API. Weigao makes worldwide friends with honest, enduring, reciprocal business styles. Please feel free to contact us at any time.