How large is the cutting diameter of my Shredder Joe SDJ616? Your Shredder Joe SDJ616 has a 19-inch wide mouth for easy loading, which funnels down into its 12-inch cutting diameter blade-less mulching system. Related articles What is the easiest way to get leaves into my Shredder Joe SDJ616? Leaf Shredder What size trimmer line does my Shredder Joe SDJ616 use? Which detergent is compatible with the SPX-FC34-MAX? Has the battery reached its full charge?