4-Way Metal Car End Trailer Plug Socket - Heavy duty connector socket. Latest design die cast 4-pole unit incorporating many new and improved features. Extended exterior and socket conceals terminals. Unique cable clamp prevents chafing - gives more cable support - saves installation time. Integral finp-pr erins for nositivp null - never shakes loose. Stainless steel spring. Dust and water resistant. Polarized. Heavy duty 6-way & 4-way terminals accept up to #12 gauge wire. 2 - 1/4inch mounting holes on 4-way sockets, 2-7/8inch on center. Mounts through 1-3/8inch diameter hole. Socket only.