The Work Sharp Knife & Tool Sharpener Mk.2 is a more advanced and versatile sharpener than the original model it replaces. The Mk.2 features a two-speed electric motor, while the Mk.1 had a fixed motor. The angle guide has been redesigned as well. The Mk.1 model had interchangeable guides, while the Mk.2 combines these into a single switchable guide with an up-down toggle. They’ve also added an Edge Guide to the tool, which supports the blade along the full travel from tip to heel for a more stable, even edge.