For Chainmaille: Works best with 1/4" jump rings. This O-Ring is thick and sturdy. Works well with European, Persian and Japanese chainmaille weaves.
For leather: This size fits mini Regaliz leather (10x4mm oval leather cord) or 2 pieces of 5mm round leather cord.
For Apparel: Color coding & size markers. Place a colored ring onto hangers to designate size or collection. These will even fit onto plastic hangers.
Audio & Lighting Cable Management: Place colored O-Rings onto cables according to cable length or usage.
Other uses: This size fits onto a standard size pen to make a good pen grip. These are also used as stitch markers for Knitting & Crochet and can also be used for Macrame. EPDM O-Rings were developed to form a waterproof seal. They can be used with LED lights to form a waterproof seal between the bulb and hardware. These have also been used for body piercings that often require a stopper of this sort, tattoo equipment, paint guns, bicycle & Industrial parts.
Sizing: The ID or Inner Diameter is the size of the hole. Generally, choose an inner diameter slightly smaller than you require. The rubber will stretch to fit over items and form a strong seal or hold items in place.
The below table shows the AR average of a jump ring combined with this O-Ring size
