Works with any full size twist pen kit that uses a Cross style refill. Tired of pressing your 7mm mechanisms too far or too short into your pen tube? Tired of inconsisent tube lengths leading to refill extensions that are too short or too long? How about all the different instructions that require measuring and marking depth guidelines on the mechanisms?. This jig solves all of those problems and presses to the perfect distance every time in only 5 seconds. This innovative jig has a pin in the front to center your pen tip with a stop in the back that guarantees a quicker, more accurate pressing distance. Simply press the tip in the normal manner and then use the jig to insert the mechanism.