These wire guardians made of 925 silver gold plated protect your threading material at the most strain transitions to the closure. The loops in which the fastener elements are mounted is easily encased in seconds. The schooner of 925 silver are rounding open to the outside, so that wire and thread "hang" comfortably and without internal to stay can be threaded.
925 silver plated
Inner diameter of the tube 0,51mm, suitable for threading material up to 0,49mm thickness.