This extension is more suitable for thicker pins. The two images have different diameters. In the thinner hexagonal normal lead and collar pins are held reliably. The other side is intended for them so-called "jumbo pencils". This is a recording is on both sides does not bother me while writing. For this low price you get a tool which can be used for a wide variety of pens. Only Kopierstifte have a round shape, or very thin lead or collar pins are not held. But somewhere the limit is reached even with a universally adjustable article. For me no reason why deduct a point. For processing would have to say, this is the extension of processed very clean, with no burrs or sharp edges.
