These alligator clips are really handy and have several uses.  You receive a set of two clips with two adapters if you need them.  A banana pin will fit right into the end of each clip.  The clip opens to 1/2 inch at the end and are 5/8 inch deep.  You can use them to connect to male snap heads, conductive tubing, silicone sheeting and other electrodes.

NOTE: When using these clips on conductive silicone, you might want to file the sharp points from the teeth to avoid cutting into or tearing the sheeting or tubing.