The W-HPC225 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 0.04 in. ( 1 mm), Waveplate Diameter(Inch) 1 Inch, Waveplate Diameter(mm) 25.4 mm. More details for W-HPC225 can be seen below.