door spring box ISO9001&ISO14001 high quality and the lower price OEM or according to your request best service

door spring box

1)Outside Diameter:205mm/220mm/240mm/200mm

2) Inside Diameter:39mm/42mm/48mm/60mm/76mm3)Assort Pipeline Diameter:38mm/40mm/46mm/60mm/75mm4)Suitable Relax Width:3-5m5)MATERIAL: galvanize or painted steel plate 6)BALL: steel ball,  nylon ball   7)THICKNESS:0.8MM,1.0MM,1.2MM 8)Height: 65mm ,80mm  or according to your requirement 9)PACKING: 20pcs/carton or nylon bag 10)MOQ: 1000pcs 11)APPLICATION: spring for roller shuttersOther Products:  hooks, end plate, shutter spring,  spring steel strip ect