The Electronic Specialties 10-pc Back Probe Kit, No. 804, features an assortment of the company's back probes designed for diagnostic and electrical troubleshooting. Each probe connects to industry standard 4mm banana plugs. The kit includes two flexible back probe pins, two spoon probe backprobers, four mini back probes/wire piercers, and two mini alligator clips. The kit comes in a hard storage case.