A very well ventilated 10 inch mirror cell. Fits 11-12"inside diameter tubes. Would make a great upgrade from the mirror cells included with most commercially made dobs. The ventilated design will speed mirror cool down times.
Note the 2 small finish dings in the image as well as the missing 1/4 nipple in the mirror holder. This is a standard 20 thread nipple which can be obtained at any hardware store. Sells for about 15 cents. Heck, if you buy it I'll go to ACE and replace it before I ship.
Shipped CONUS for $40.00