These seemed fine until I installed them and realized that the four that I bought were somehow all defective. I was trying to diagnose a problem with the project these were installed on, then got frustrated and left the project alone. Once I got back to the project and found that these potentiometers were not working properly, it was too late to return and I can't find how to contact the seller. Either there was a bad run of there or they are just cheap garbage. Either way I would steer clear and do not buy.