Uni-Lock Lever-Action Connector. Available only on SMS Connectors. Unique connector back and D-style pins prevent arcing. Longer set screws prevent barrel fall-through. All-rubber connector wall not go out-of-round. Engages mechanically - eliminates couplers seizing together. Single-barrel pilot pins with two set screws. Two grommets with O-ring seals. Six-fingered female contact pin for positive contact. Connectors are water and dust tight when engaged. Suitable for Mining: shuttle cars, cutting machines, distribution boxes, drills. Industry: large motors/test stands for checking motors, lockable hookup to large portable equipment, steel mills/power for locomotion equipment. Military: ship-to-shore power. Railroad: car-to-car power.