These ring terminals from Uriah Products are designed for automotive use, and they accommodate wires that range from 22-18 AWG, and they feature #8 studs (0.164"/4.166 mm). They're made out of copper plated with zinc for maximum conductivity, and the nylon insulation shrinks under heat to create a waterproof seal. They also feature a 3-piece design that provides greater pull strength and strain relief compared to regular ring terminals. | Uriah 22-18 AWG #8 Stud Heat Shrink Ring Terminals 10 Pack in Red