A must tool for hand-stitching. Wheel marks stitching holes quickly and evenly spaced. Then go back and punch holes with awl. Comes with 3 steel spacer wheels in 3 popular sizes per inch. Metal ferrule for strength and contoured hardwood handle for comfort. Change-out wheels with a small flat or Phillips head screw driver. Wheel sizes: 6 mm, 5 mm, 4 mm