We are dedicated to providing everyone with the best home products for all home needs, with a focus on reliability, customer satisfaction and great quality. We offer modern, high-quality products to be enjoyed by many customers. Characteristics. Retractable test leads. Used to test electrical circuits. Retractable test leads are removed and remain at the desired length. Rewinds test leads into their own protective sleeve when not in use. Has insulated alligator clip. Specifications of 18 gauge copper wire. Size 40