Antique Brass Wire Guardians. Sold per package of 20.
Antique brass colored wire guardians protect all stringing materials from undue wear by keeping wire from being worn by clasps or other sharp-edged components.
These wire guardians measure about 5mm in length and have an inner diameter of 0.22" (0.56mm), so any wire smaller than that will fit. Beading 101 - How to use Wire Guardians
Watch the video below for a quick demonstration on how to use this product: