I tried one of these for canning season last fall. If the ear of corn fits in the tube, the cob will usually fit the corer too, and this tool will make short work of pushing off the kernels without risk of cut fingers or spilling the contents of your collecting bowl. It does take a little bit of strength, but if you twist the cutter back and forth as instructed, it works well. You can do two dozen par-boiled ears in about 15 minutes. It can actually make a chore into some fun.