The small aluminium hook is a nice little carabiner to bring along for multiple uses. Made of ultra strong aluminium and equipped with an easy snap feature it can be used to hang accessories inside the tent such lamps, to bundle together smaller items like cutlery or to attach to your belt for extra gear. The Nordisk Nametag is elegantly carved into the mat surface, which has been designed with no sharp edges to prevent it from damaging fabrics. The lock is simple yet functional with a small spring to secure that it stays locked when you need it to. A great accessory to make things a bit easier.