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Product Paramenters：
Model : Customized according to customer needs
Contact us and give us the size of the product you need. We will process it in the factory at our fastest speed, test it to the highest standard, and send the goods to you in time to ensure the smooth progress of the project
| Spring | OD*ID*Dia*H*Number of turns | Suitable kelly bar type |
| 255*185*35*260*4.5 | 299 | |
| 325*235*45*385*5 | 355 | |
| 370*270*50*400*4.5 | 377 | |
| 400*300*50*400*4.5 | 394/406 | |
| 400*290*55*400*4.5 | 406 | |
| 420/400*310*55*4.5 | 440 | |
| 430/450*310*60/70*400*4 | 470 | |
| 470*310/350*80/75*370*4 | 508/530 | |
| 535*375*80*3.5 | 580/630 |
Product Paramenters：
Model : Customized according to customer needs
Contact us and give us the size of the product you need. We will process it in the factory at our fastest speed, test it to the highest standard, and send the goods to you in time to ensure the smooth progress of the project
| Spring | OD*ID*Dia*H*Number of turns | Suitable kelly bar type |
| 255*185*35*260*4.5 | 299 | |
| 325*235*45*385*5 | 355 | |
| 370*270*50*400*4.5 | 377 | |
| 400*300*50*400*4.5 | 394/406 | |
| 400*290*55*400*4.5 | 406 | |
| 420/400*310*55*4.5 | 440 | |
| 430/450*310*60/70*400*4 | 470 | |
| 470*310/350*80/75*370*4 | 508/530 | |
| 535*375*80*3.5 | 580/630 |
