Replaceable-blade hand deburring tools smooth rough edges around holes, countersinks, and straight edges and remove projections that can cause parts to be out of tolerance, which negatively affects how parts fit together. The blade slides along an edge to remove projections and ease edges and transitions to provide a smooth edge. Blades can be removed and replaced with a different shape or a new, sharp blade as needed. Blades are shaped for different cutting angles and applications and are often replaced when they become dull.