The AWP 225H from Foctek Photonics is a Waveplate with Wavelength Range 450 to 1650 nm, Waveplate Thickness 8 mm, Waveplate Diameter(Inch) 1.2 Inch, Waveplate Diameter(mm) Mounted in Ø25.4 mm aluminum mount. More details for AWP 225H can be seen below.