Hand deburring tools and blades smooth sharp edges on metal workpieces. Deburring removes projections that can cause parts to be out of tolerance and negatively affect how well parts fit together. Smoothing edges and bore holes also removes sharp filings that can cut hands or scratch surfaces. Replaceable-blade tools can hold different shaped blades. Adjustable-length tools reach into recessed areas and provide additional knuckle clearance. Kits include a selection of blades and handles. Deburring blades fit into handles and blade holders and are designed to suit specific edge shapes. Handles hold blades and blade holders. Blade holders extend the reach of the blade. Disposable hand-deburring tools are disposed of when the blade dulls. Fixed-blade deburring scrapers smooth straight edges.