This is a 1.25" to 2" eyepiece adaptor with built-in 2" filter thread to take 2" filters. It allows 1.25" eyepieces to be inserted in a 2" eyepiece holder, and features an integral 2" filter thread and an internal brass collar to stop the clamp screw marking your chrome eyepiece barrels.

The adaptor fits all 2" eyepiece holders, and allows the use of 1.25" eyepieces as well as 2" filters. This is a very useful feature if you own 2" filters, as it allows the eyepiece to be changed without removing the filter.

Made of aluminium and hard-anodised in a semi-gloss black finish. A nice touch that sets this adaptor apart is the brass collar that prevents the lock screw marking the chrome barrel of your eyepieces.