440mm (17.32″) total length 410mm(15 3/4″) eye to eye Eye Diameter: 10mm/12mm/14mm Package includes 1 Pair Motorcycle Shock absorber Provide Different Colors.A small knob is an air cock. Pls kindly that please do not touch it and not screw it out when installing the shock. Once screwed out, it will spray oil out. A big knob is a decoration cap, which can not be adjusted. Description: 440mm (17.32″) total length 410mm(15 3/4″) eye to eye Eye Diameter: 10mm/12mm/14mm Spring thickness:8.0mm Max loading: 300 kg (661bl) Package Including: 1 Pair Shock absorbers Note: Different styles of shocks are sent randomly. A small knob is an air cock. Pls kindly that please do not touch it and not screw it out when installing the shock. Once screwed out, it will spray oil out. A big knob is a decoration cap, which can not be adjusted.