The optional diamond windows for the Micro HeatIR Sampling Accessory are recommended for hard samples that would scratch or fracture an IR transparent window. The diamond window set permits higher force to be applied to the hard sample, flattening it for IR transmission analysis. The diamond windows option includes a set of 2 mounted in stainless steel disks, 13 x 2 mm in size and the clear aperture of the diamond inserted within the center of each circular disk is 2 mm in diameter.