Hemline yacht and caravan snaps give you a fantastic starter set for superior quality rust proof studs that ideal for caravans tarps tents and more outdoor heavy duty items quick and easy to attach screw replacing the usual stud to allow the bottom snap sets to be screwed to wooden or plastic deckingthe snaps measure 15 mm in size and the kit includes 10 sets of these as well as a screw fitting tool size 15 mmcolour silverrust proof and superior qualityideal for caravans tarps tent