Spring is for kelly bar accessories, it assumes spiral-shaped, the
elasticity is strong, each different type of spring is suitable for
different type of kelly bar.
We can offer many types of spring for kelly bar.Type
as below: 355/377/406/445/470/508/558
Beijing Dazheng Yongye Construction Machinery Co, . Ltd is
specialized in selling new rotary drilling rigs, full-rotary
drilling rigs and marketing various buckets, supply spare
parts.
