Ring stopper - 4mm$0.15 AUD
This is often used to prevent small diameter, rope or shock cord from moving past a certain point. Also can be used on hammock whoopie slings to prevent the adjustable loop from being drawn in on itself.
Internal diameter 4mm
Pack of 10: $1.30 ($0.13each)
Pack of 100: $10.50 ($0.105each)