Heavy-duty, bakelite crowfoot-design electrical receptacle with 2-pole/3-wire grounding for surface mounting. NEMA 10-50 standard.

Heavy-duty vinyl crowfoot design electrical plug with three heavy-duty brass blades. Has an extra blade to convert to 30 A plug. NEMA 10-50, 10-30.

Heavy-duty bakelite pin-type design wall electrical receptacle with 2-pole/3-wire grounding for surface mounting. 50 A, 125/250 V capacity. NEMA 6-50.

Heavy-duty, vinyl pin-type design electrical plug with two brass blades and half pin. 30/50 A, 250 V capacity. Has extra blade to convert to 30 A plug. NEMA 6-30, 6-50.