If you are cheap or short of time, you can make your own from a short length of brake pipe! I did this for my bulkhead connector terminals. Cut a length, put it in a drill chuck, and then sand or file the outside diameter until the wall thickness is thin (that's a technical term - 'thin' ).
Quick and easy. If you have a bunch to do, I'd buy the tool....
or short of time, you can make your own from a short length of brake pipe! I did this for my bulkhead connector terminals. Cut a length, put it in a drill chuck, and then sand or file the outside diameter until the wall thickness is thin (that's a technical term - 'thin' 
).