They are equipped with a sliding plastic clip for size control and a plastic clip for fastening. In addition they are equipped with a lock to prevent accidental opening except size 20-35.
The plastic clip is pulled through a metal hole designed to fasten the strap, and only after passing through this eye the clip engages in mating. The pressure exerted in pulling the guide from the ring is then distributed to the nylon strap and therefore the plastic clip is not under pressure.
There is no risk of damage to the plastic clip even in the event of excessive pulling.
