This brass jump ring tool is a great assistant for opening and closing jump rings! Just slip over the tip of your finger, and use the four different-sized slots (anging from about 0.9mm to 1.85mm wide) to open jump rings of various gauges.

This is the exact same jump ring opener I use in my videos, and honestly one of my favorite single-purpose tools.

Made of silver-finished brass. Inside diameter measures approx. 17mm.

Sold individually. Last photo shows screenshot of item in use for illustrative purposes.