This is a 33009FL01-010R Float Glass Plane Ruled Diffraction Grating, a high-quality optical component sourced from MKS/Newport. The grating, which is 25 x 25 x 6 mm in size, is designed for use with a wavelength of 588 nm and features a blaze wavelength of 300 nm.
The grating is coated with a front coating of nwr 53-010r-1092-1, enhancing its performance and durability. It has 600 grooves per millimeter, with a blaze angle of 5.2 degrees, and an order of 1. The orientation vector is along the x-axis, and the grating side is the front side.
The grating is rectangular in shape, made of soda lime ru clear material, and is available for purchase directly from the vendor's website, where it is currently in stock. The web link provided leads to the product page for easy access and purchase.