MULTI PACK INCLUDES FOUR SPIKED TREE FELLING, BUCKING, LOGGING WEDGES. SIZES 5.5", 8", 10" AND 12". WEDGES ARE USED TO HELP GUIDE THE DIRECTION THE TREE IS GOING TO FALL BY INSERTING THEM BEFORE THE FELLING CUT, LIFTING THE BASE TOWARDS THE OPPOSITE DIRECTION. THE SPIKES HELP BY GIVING A BETTER HOLD AND CONTROL OF YOUR WORK SO THE TREE FALLS IN THE APPROPRIATE DIRECTION. THE WEDGE SIZE YOU CHOOSE DEPENDS ON THE SIZE AND TYPE OF THE TREE MAKING A MULTI PACK VERY USEFUL. THE WEDGES ARE VERY DURABLE.