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You will receive 180pcs blue 16-14 AWG heat shrink butt connector. Features: Ratio of the connector is 3:1 Waterproof level: IP67 Operating temperature: -55 ℃ -125 ℃ Thick barrel ensures strong crimp every time - your wire will never slip out of the connector. Steps for usage: 1.Measure your wire and choose the right size connector by looking at wire gauge imprint. 2.Insert the two wires to the right connector and crimp the metal part in the middle of the connector by pliers. 3.Apply heat to the two end of the connector to make it tighten up the wire.