Crampons with strap and case

These are strap-on crampons made in China, purchased online.

I used them once last year. I wrote on them to easily distinguish left from right.
When the back plate is set to its largest setting, the distance from the front tip to the heel protrusion is approximately 29 cm, and at its smallest setting, it is 24.6 cm. It is possible to extend the plate beyond the heel protrusion and make the size even smaller, but I am unsure if it is walkable in that state.
The weight is approximately 1.1 kg.
The straps are 77 cm long.
A case is included.

Please note that these are amateur measurements, so there may be some errors.
No returns or exchanges. Thank you for your understanding.