This is a 33009FL01-210H Reflective Grating from MKS/Newport, a leading vendor in the optical industry. The grating, which is rectangular in shape, measures 25 x 25 x 6 mm and is made of soda lime ru clear glass. It is designed to work with a wavelength of 588 nm and features a front coating of nwr 53-210h-5125-m-1.
The grating has a blaze wavelength of 450 nm and contains 1200 grooves per millimeter. The orientation vector is set at x=1, y=0, z=0, and it operates at the first order. The grating side is the front, and the item is currently in stock, as indicated by its valid weblink status.
For more detailed information, you can refer to the vendor's website at https://www.newport.com/p/33009FL01-210H.