The W-QPA225 from Ross Optical Industries is a Waveplate with Wavelength Range 266, 355, 532, 632.8, 780, 808, 850, 980, 1064, 1310, 1480, 1550 nm, Waveplate Thickness 8 mm, Waveplate Diameter(Inch) 1 Inch, Waveplate Diameter(mm) 25.4 mm. More details for W-QPA225 can be seen below.