This is a 33067FL01-270R rectangular float glass plane ruled diffraction grating, sourced from the reputable vendor MKS/Newport. The grating, which measures 25 x 50 x 6 mm, is designed with 300 grooves per millimeter and is coated with a front coating of nwr 53-270r-1229-1sp.
The grating is of the blazed ruled reflective type, featuring a blaze wavelength of 500 nm and a blaze angle of 4.3 degrees. The orientation vector is set at x=1, y=0, z=0, and the grating is designed to operate at the first order. The grating side is the front side.
The item's physical data indicates that it is made of soda lime ru clear material. The web links provided lead to the product page on the vendor's website, where users can find more information about the grating, including its current stock status.