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I run a tree company and when cutting up a large trunk into rings we split them into quarters so they can be lifted on the truck. I use a 14 lb sledge hammer. So far no ring unsplittable at usual 9 inch thickness. This saves fuel, less noise and saw dust to clear up. Straight out of the parcel shaved a section of my arm as expected from Gransfors Bruks.
Clive Cummings4th February, 2020