Package Contains 2 x red wire piercing probe 2 x black wire piercing probe Product Parameters Product Color: Yellow body, red and black to distinguish positive and negative Size: 9.6x1.96cm / 3.78x0.77" Material: High quality plastic Wide Range of Applications The piercing clip set can be released from the insulated wire without piercing the insulation layer, to help you easily complete voltage measurement, suitable for car repair, equipment repair and home appliance repair, etc. Perfect Size: 9.6 x 1.96cm / 3.78 x 0.77 inches, the size fits into your toolbox, takes up little space, and fits most plug pens, 4 x wire piercing probe, it can meet your daily needs Unique Design: The wire piercing probe comes with steel springs and brass jacks, and contacts use insulated wires, no need to cut or strip the insulation, which ensures you can use it safely. Spring-loaded double V-clamps hold wire in center for piercing insulation, small holes can be sealed with 2mm banana plug test leads High-Quality Materials: Our wire piercing tool are made of high-quality plastic materials, which are sturdy and durable, not easy to bend and deform easily, suitable for your long-term use Wide Range of Applications: The wire piercing clips can be released from the insulated wire without piercing the insulating layer, to help you easily complete voltage measurement, suitable for car repair, equipment repair and home appliance repair, etc. Simple to Use: You just need to insert the threading probe into the banana jack, clamp the wire with the probe, and then measure the voltage with a voltmeter, the red and black of the piercing clip set are used to distinguish the positive and negative