This is a 33025FL01-080R 12.5 x 12.5 x 6 mm Float Glass Plane Ruled Diffraction Grating, available from MKS/Newport. The grating has 600 grooves per millimeter and is coated with a front coating of nwr 53-080r-728-84-1.
The grating is a Blazed Ruled Reflective type, designed in a Rectangular base shape. The geometry of the grating includes a width of 12.5 mm, a height of 12.5 mm, and a thickness of 6 mm. The Inner and Outer Radius are both zero, indicating a flat grating surface.
The grating is designed to operate at a wavelength of 588 nm. The physical data of the grating includes a blaze wavelength of 400 nm, a blaze angle of 7 degrees, and an orientation vector of (1, 0, 0). The grating is designed for first order operation (order = 1) and the grating side is the front side.
The grating is made of soda lime ru clear material. According to the vendor's website, the grating is in stock and available for immediate purchase. The product link is: https://www.newport.com/p/33025FL01-080R