Pragmasis Protector high security chains span a range from the ultimate, military, situations, through to light-weight and portable applications. They are very frequently used for motorcycle security and bicycle security, but are also used by the UK MoD and NASA in the States, to cite just a couple of example customers.
This video gives a quick visual overview of the whole range, including suggestions of likely applications for each chain. We have more videos about our chains and our other products.
There is also much more detail and guidance on our Protector chains and locks that suit them on our web site: