Stinger SPT520 Pro Ring Terminal 1/0 Gauge 5/16" Hole The Stinger SPT520 allows you to have a clean ring terminal installation. Allows 1/0 gauge wire input and 5/16" ring opening. Included are one red and one black rubber ring for either positive or negative use. PRO 1/0ga Input to 5/16" Ring Shoc-Krome Terminal. Included are both a positive and negative rubber ring for either positive or negative use.