The 5188 is a Test Lead with BNC (female) to Micrograbber? test clips. The BNC with nickel-plated brass, gold-plated beryllium copper centre contact, 20AWG PVC wire. The Micro grabber test clip with gold-plated beryllium copper contact, stainless steel spring, glass filled nylon insulation. BNC connector and Micro grabber test clip cap are moulded directly onto the wire for pull strength durability and dust and moisture resistance. Micro grabber test clip hook is Beryllium Copper for superior strength.