Quick-change thumb operated button for instant removal, insertion and locking of new blades. Supplied with three blades: for steel and aluminum, for brass and cast iron and for straight edges on all types of metals. Hollow handle with a removable end cap for storage of blades. Unique rounded head blades for safe deburring of drilled and machined holes, end milled areas, tubing, backside of holes and an almost unlimited amount of uses. Curved blades swivel freely to automatically follow shapes, contours and holes