The Fluke AC89 Heavy Duty Insulation Piercing Test Clip is a single probe that pierces .25 to 1.5 mm insulated wire. The small pin allows self-healing of the insulation. It is CAT IV 600V, CAT III 1000 V, 5 A rated and UL listed. The Fluke AC89 Heavy Duty Insulation Piercing Test Clip is sold as one item per package. Fluke Corporation is the world leader in the manufacture, distribution and service of electronic test tools and software. Since its founding in 1948, Fluke has helped define and grow a unique technology market, providing testing and troubleshooting capabilities that have grown to mission critical status in manufacturing and service industries. From industrial electronic installation, maintenance and service, to precision measurement and quality control, Fluke tools help keep business and industry around the globe up and running.