Ring Terminal, Heavy Duty, Vinyl Insulated, 16 - 12 American Wire Gauge (AWG), 5/16 Inch Stud Size, Funnel Entry. Manufactured from stock 56 percent thicker than a standard No. 16 - 14 AWG terminal for use in heavy-duty applications. Insulation housing is marked with HDR to signify heavy-duty ring. Ring tongue design assures a secure connection in high vibration applications. Insulation support helps to prevent wire damage in bending applications. Brazed seam protects terminal barrel from splitting during the crimp process. Internal barrel serrations assure good wire contact and maximum tensile strength. UL Flammability UL 94V-0, maximum insulation temperature 221 degrees Fahrenheit (105 degrees Celsius). UL and CSA rated up to 600 Volts per UL 486A/B. Standard Package.