I dont agree with you. I have Mav choppers, they come with stock serated knives. I required wider straw spread, so New Holland gave me wide spread kits to solve the problem. All the kit consists of is a knife with a paddle or a wing on one side of it, the other side is a cutting edge. A kit contains 8 pairs of knives installed on 2 rows of the chopper. They look like the same product that Redekop puts in their chopper. And by the way, they are not housed in a squirrel cage and they do chop.