This auction is for a 45 degree mirror that is a high reflector for 600-700nm, so it was probably designed to be centered around 650nm or so.  It was manufactured by Coherent for Agilent Technologies, and is Agilent part number 10726-80001.  The reflective surface is 30mm X 22mm, and the mirror is cut in a trapezoidal shape to allow use at 45 degrees angle of incidence.  A beautifully made, high quality optic that will work perfectly for your high power visible diode projects.

Be sure to visit my Ebay store, Cheap-Optics, for lots more great deals on mirrors, optics, Newport stuff, and other optical mounts. Use the easy-to-use categories and searches on the left side of the store to find just the optics you need.

Payment by Paypal is preferred, but also cashier's check or money order.