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Rolling Door Spring 

1. Material: 65Mn
2. Finished: tempered and hardened, black / blue finished, round edge  HRC46-48
3. Size: 1.0-1.6 mm thickness  40-100mm width  3-6m length
4. Packing: 10pcs/carton  oiled, plastic film, carton, iron pallet
5. Moq: 5ton
6. Delivery time: 30days upon receipt of your deposit 

Other products:  Spring steel strip(blue, black, bright, yellow), hot tempered & hardened steel strip(for saw, shutter spring, trowel, shove, etc), rolling door accessories(spring box, door handle, interior hook)