A dedicated bump key set for the Ultion range. The Ultion bump key for the original profile, I prefer the pull out one tap method however if you wish to use rings I’d advise 4. The WXM bump key fits most profiles of the lock including the newest X3 profile, these are cut on both sides in case you damage the tip making it hard to insert, simply flip round and use the other side and file the damage at a later time. I have found that locks susceptible to bumping go in to a false set quickly indicating that you should continue. I have had some good success rate on all versions and is a useful addition to the tool chest.