Hewlett Manufacturing has been producing our flat diamond hones for years. The diamond coating quality is consistent to our lifetime guarantee.These American-made products offer a lifetime guarantee and will continuously perform like new every time for years to come. Completely manufactured, assembled and packaged in the USA.Over fifty years ago, the original oval design and diamond coating of knife sharpeners was introduced to the professional trade by Harlan D. Hewlett, founder of Hewlett Manufacturing.Hewlett Manufacturing is the originator and world leader in diamond sharpening. Their diamond coating is aggressive enough to provide a razor sharp edge yet will not harm your expensive knives. Hewlett diamond sharpeners are made of industrial monocrystalline diamonds, meaning they are one headed - not multi-headed - which makes for a perfectly even surface. These American-made products offer a lifetime guarantee and will continuously perform like new for years to come.
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