There are longer blades- box-cutter replacement blades. Even though you can improvise a handle by wrapping tape around them, it is one of the more foolhardy things I've seen done in years. And they are designed to snap, so maybe not.<br><br>And they can be stroped on glass, with the top of a car door window being about the best I've found. <br><br>If you pack a pencil stub in your PSK, then a handle is easy to make for a razor blade, and the curved ones that are more like a surgical scalpel have more cutting edge than those that are stamped on diagnal.