A serious piece of kit - two straps made of heavy duty nylon web with two stainless steel cables in each strap and heavy, rust-proof, lockable clasps with protective rubber housings.
If you want to easily secure multiple boards to your roof rack this is probably the easiest way going (as easy as your standard straps anyway and much stronger).
Of course no system will completely stop the most determined thieves but it'll certainly make your car better protected than the one next to it in the carpark. The system is designed to lock the straps under tension to prevent the boards sliding out so the only way to remove them is to cut the rack bars...
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