Most common and versatile Alligator clip. Compatible with all shrouded, unshrouded and retractable 0.16” (4mm) banana plugs. Can also be attached by solder or crimp connection. Material: BU-60 -- nickel-plated steel, BU-60C -- solid copper, BU-60X -- stainless steel (including spring and rivet). Rating: 10 Amps. Mates with BU-62 series PVC insulators.