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[[File:Scotchlok connector.jpg|180px|thumb|right|A Scotchlok connector.]]
Scotchlok connectors contain a piece of metal which cuts through the insulation and bites into the copper conductor. They are commonly used in auto electrics for splicing into power wires in order to supply after-market accessories. They contain two holes for two wires, one open at the side allowing it to be slipped over an existing wire, and the other a blind hole to take a lead to the accessory. Squeezing it with a pair of pliers causes the metal piece to cut through the insulation of both wires and make the connection. Folding over the flap allows you to lock it closed.