Starlight Instruments, Product description Howie Glatter 1 1/4" tuBlug Barlow Element for all Holographic Laser Collimator This small part will be mounted at the end of your Laser Collimator. So it enables you to easily collimate the main mirror of your dobsonian, because also at very large dobsonians and newtonians you can see the tuBlug and collimate it at the same time. Delivery contains: tuBlug 1 1/4"

Item condition: new and original packed