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Fiskars Splitting Wedge is a specially helicoidally shaped wedge which makes the wood burst more easily for larger logs that resist splitting with a typical splitting axe strike. Inserting the wedge into a cut aperture and then striking it with a sledge hammer will reduce the need to use several wedges because of its special shape. This wedge features a rounded head to avoid material fragmentation and is made of forged steel for robust performance.
You can buy this product from the listed shops.