It just came up last night at work. I asked my boss who has been doing this for years if there is a way to tell a sealed vs a unsealed collet from one another and he couldnt give me an answer. So my question for you fine gentlemen is? is there actually a way to tell if the collet is sealed or not without having to put a tool in it and put in machine to see. I am going through and organizing our shop some and really would like to keep the sealed and unsealed seperate to help with quicker tool changes between changeovers since we dont have enough CAT40 holders to have tools for each program set and ready to go