This is a 33066FL01-201R Float Glass Plane Ruled Diffraction Grating, sourced from the reputable vendor MKS/Newport. The grating, which is available for purchase directly from their website, is currently in stock.
The grating is a Blazed Ruled Reflective type, with a rectangular base shape and a geometry that measures 12.5 mm in width, 25 mm in height, and 6 mm in thickness. The grating has no inner or outer radius, and it is made of soda lime ru clear material.
The grating is designed to work with a wavelength of 588 nm, and it features a coating on the front side (nwr 53201r105511p). The physical data of the grating includes a blaze wavelength of 500 nm, 150 grooves, a blaze angle of 2.2 degrees, and an orientation vector of (1, 0, 0). The grating is intended for use in the first order, and the grating side is the front.