1/4 inch hex drive Impaktor insert bit for hexagon socket screws, 50 mm x 6 mm. The Impaktor technology ensures an above-average service life, particularly suitable for use with impact drivers. The rough Diamond coating reduces the danger of slipping out of the screw recess. Made by Wera. The diamond coated tip of bits can hardly be seen because the surface of the tip has nearly the same colour as the bit itself. But can feel the rough surface of the tip with fingers or nails.