The Stitching Groover is an adjustable tool used to remove a small groove of leather. To use it set the width required (which is the distance the groove will be from the edge) then pull the tool towards yourself. The Stitch Groover has a small screw fitting on the top for adjustment. Spare blades are available and this tool will only take the Stitch Groover Blade (not the Saddle Groover Blade). They are used to make a groove in the leather so that stitching is recessed or for simply making a decorative cut along the edge of leather.