Package Includes: there are 6 pieces of wire piercing probes in the package, enough to meet your daily uses and replacements, in case of its wore or missing. Sturdy Material: this piercing clip set is made of quality plastic, which is sturdy enough that it won't break or deform easily, assuring your long term use if stored well. Appropriate Size: the insulation piercing test tool measures 9.6 x 1.96 cm, and can be applied to most test probe pens. Easy to Use: plug the wire piercing probe into the banana jack, then use the probe to clip the wire, and then use a voltmeter to measure the voltage. The piercing clip set can release from insulated wires without piercing the insulation, and can meanwhile measure the voltage. Wide Applications: these wire piercing clips can be applied for car maintenance, equipment maintenance and home appliance maintenance, etc., helping you complete voltage measurement work. Main Color: red, black, yellow Size: approx. 9.6 x 1.93 cm Main material: plastic Package includes:6 x Wire piercing tools