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312 Bonnell spring unit
312 Bonnell spring unit
Spring wire thickness:1.9mm-2.5mm
Helical wire:1.3mm-1.6mm
Border wire: No
Height:8cm-23cm
Turns: 4-7
Spring wire thickness:1.9mm-2.5mm
Helical wire:1.3mm-1.6mm
Border wire: No
Height:8cm-23cm
Turns: 4-7
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