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As long as the mounting holes match up, and the angles are the same you should be fine. My advice though, get a good sharpening stone and practice on old kitchen knives to get your angles down... once you master that you can stretch out the life of those old blades... if nothing else keep them for spares
I usually do get them sharpened, but this auger was giving to me, and the blades are really rusty!!
I have a 6" Mora Hand Auger that I need to get new blades for. So do I have to get Mora blades for it which cost $24 or can I get the Polar Ice Auger Blades that cost $12? When I took the Mora blades off there were little metal spacers under the blade near the cutting side.