I searched for some time for a simple solution for load securing of lightweight objects such Astschnitt, bark mulch, boxes, etc., so that nothing flies from the trailer. Although our trailer has a railing, the fuse with different width straps was no solution for such transports! But where should I attach Strech net or tarpaulin with Elastikseilen? Then I saw this round buttons on Amazon. Which are fixed with the enclosed wood screws in open car trailers with tail lifts of wood materials in less than 10 minutes! The number is sufficient for normal trailer sizes! Have the clamping power now always in the trunk for "all cases". Arm in arm on the circular buttons: Done! Cheap and quick fix!