Our SM1 threaded lens tubes hold Ø1" (Ø25.4 mm) optics. SM1 threading is compatible with our 30 mm Cage System, which allows customers to build complex optical setups with minimal setup time. This is our most popular series of lens tubes and thus, has the most extensive line of accessories and compatible parts. The compatible parts include a laser diode mount with temperature control, fiber connector adapters, and collimation adapters for fiber collimators. Additionally, the majority of our Ø1" mounted optics come in SM1 threaded mounts.