A bit of sizing confusion so I used vernier calipers to measure everything. Quantity is 5 pieces. Corbin clamps (springs): 6.3mm slack - 7.6mm max : 8.1mm slack - 10.5mm max : 11mm slack - 12.5 max : 13mm slack - 14.5. max: 14.5mm free - max 17.5mm. There are also some types of screw tightening: 15.5mm max (don't break): 16.5mm max is cheap as mentioned so you won't get a perfect circle to measure. The dimensions are therefore not exact. I tried to slowly compress the springs fully with pliers to see if they break, if they break.
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