UPDATE: The Tumbler Knife Sharpener is a Knock-Off - Core77

Remember that elaborate Ixi Ruixin Pro knife-sharpening rig? In contrast, look at how simple and elegant the design of this Tumbler Diamond Rolling Knife Sharpener is: The magnetic block offers a 15-degree angle on one side, and a 20-degree on the other. The

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UPDATE: The Tumbler Knife Sharpener is a Knock-Off - Core77

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Tumbler Original Diamond Rolling Knife Sharpener Set – Tumbler Rolling Knife Sharpener

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The Original Tumbler Rolling Knife Sharpener™ - Knife Sharpening Made Easy - Rolling Knife Sharpener Tool for Kitchen Knives - Knife Sharpener Kit Offers 15 & 20 Degree Sharpening: Home & Kitchen