Sherco Automotive & Marine Supplies Non-Insulated 4 AWG Ring Connector 5/16" Stud Uninsulated Wire Terminal - USA Made Part # R4-516 Terminal Type : Ring Connector Fork / Stud Size : 5/16" Package Size : 25 Pieces Our Non-Insulated Wire terminals are constructed from pure copper (Alloy 110), annealed & electro tin plated for Exceptional Corrosion Resistance. All terminals have V groove serrations To provide maximum contact and tensile strength after crimping . - All terminals constructed from pure copper (Alloy 110) annealed & electro tin plated for exceptional corrosion resistance. - Terminals have V groove serrations to provide maximum contact and tensile strength after crimping. - Terminals and connectors are clearly marked with size. - Mil Specs: MIL-T-10727C Type 1 ASTM B 545 B. .0001-.00025 Thick - Made in USA