Astromania 1.25" / 2" Twist-lock adapter - firmly and gently holds and centres your eyepieces Allows you to use 1.25" eyepieces in any 2" telescopes focuser, star diagonal, or holder.One twist, and your accessories sit firmly in place, gentle clamping over a large area. Use Twist Lock adapter as a high-end reduction ring. It is gentle with the accessories and yet clamps them in place with incredible force. This is a very high quality anodized aluminum adapter, self-centring 2" to 1.25" adapter with 2" thread. Ideal for using high-power, low focal length 1.25" eyepieces in a big 2" telescope focuser. An affordable way to increase the number of eyepieces to use with your 2" focuser-equipped telescope.