A fixed length ring security seal is perfect for most transport applications; truck, trailers etc, where a security seal under tension on a roller shutter or barn door latch would break due to the flexing of the rear doors in transit.

One of the most important security features of a fixed length seal is that the built in weak point is situated outside the locking mechanism housing but close enough to prevent pliers being used on the strap or ribbon to prise the seal open. Another important feature is some free movement of the seal inside the housing, which demonstrates it has not been tampered and glued back in place.

As with all types of security seals it is important to control the number, colour and type of security seal being used to prevent substitution.

One of the benefits of ring security seals is the push to shut mechanism - the seal will give a 'click' confirmation of closure, without having to recheck if the seal has sealed. This can be very useful on trucks and trailers, particularly where seals are going to be attached in adverse weather, as the ease of fitting is increased.