[Specification] -- Size = WD * OD * Long
[WD] -- 2.5mm
[OD] -- 7mm
[Long] -- 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 180mm, 200mm, 220mm, 240mm, 250mm, 260mm, 280mm, 300mm
[Package Include] -- 2pcs/5pcs Tension spring ( hook opening )