Manufacturer:Grip OnFeatures and Benefits: Set contains 5 most popular individual sizes Removes screws and bolts without damaging the threads Non slip, double edge engagement removes the toughest fasteners Large hex-head surface provides an outstanding grip Can be used on both right and left handed threads Set contains individual sizes #1 - #5.  Manufactured in Germany by Rennsteig, a division of Knipex. Large hex head design is easier to grip and turn.  Integrated center point for accurate drilling.  Packaged in a descriptive vinyl pouch.