Telescope-Collimation Tools-Bob’s Knobs Celestron f/11 C14 Secondary Collimation Knobs – Metric Phillips

what our customer say this product:

1. Greg S. Verified Buyer – 12 February 2017

   I like Bob’s Knows. The only problem I had was one of the know and would loosen and the plastic portion over the screw broke off. Fortunately the screw has a Allen head and was able to loosen the screw. I still recommend Bob’s knob’s.