Features:All kinds of standard test probes can be used to check the lever nut.Don't need any tools to connect wires, just using your hands.There is a test hole at the back of the lever nut and the hole are designed to check whether the wires have electricity or not.You don't need to worry about a twist between the wires when you combine the wires. These lever nuts are safer than other methods for connecting wires due to use PC insulating material.Transparent and high quality cover, which can make you check the wire length, complete wire insertion through its transparent cover. It is convenient to confirm whether the wires plug the jack or not.Using Method:Open the housing of wire to 0.35-0.47inPush the orange levers to 90 and insert the wiresThree is a test hole on the back of the connectorReplacing wires method.Push the operating levers to pull the wires outNote:The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.Please allow slight manual measurement deviation for the data.What's included:3 different models of Lever-Nuts in a convenient plastic case2 Port,PCT-412 (35pcs)3 Port,PCT-413 (25pcs)5 Port,PCT-415 (15pcs)