Product Size: The size of the wire piercing probes is 96x20mm/3.78x0.79in, small and portable, convenient to carry and store. The slider measures 22mm/0.87in and the wire slot measures 5.5mm/0.22in. They have 2 sizes of small holes, which are 2mm/0.08in and 4mm/0.16in, sufficient to meet your different needs. Easy to Use: It is convenient to use the wire piercing probes. You only need to adjust the carbon needle, insert the test pen, insert the test wire into the hook and wait for the test result. You don't need to cut the insulation layer when use them. They can contact with insulated wire and protect your wires when testing. Product Content: You receive 4 pieces of wire piercing probe, and reliable. A sufficient quantity to meet your needs of usage and replacement. Premium Material: The wire piercing probes are made of quality PA material and -plated copper, tough, , scratch and not easy to break. You can feel confident to use them for a long time. Wide Application: The wire piercing probes can be widely use on equipment and home appliance repair. They can fit for most insulated wires. You can feel confident to use them., Manufacturer: Akfldms