48 Split Ring Fishing Lure, Connector Nickel Plated Spring Steel 9mm Made in the USA O.D. Tolerances: Steel and Stainless Steel + .015 - .005 Approx. thickness .040 in / 1.02 mm Outside Diameter .380 in / 9.65 mm Nickel Plated Stainless steel Approx Inside Diameter .300 in / 7.62 mm