The Cylindrical Cell Holder mounts fused silica cylindrical spectrophotometer cells in IR and FTIR spectrophotometers and properly aligns the cell in the path of the instrument’s beam. This holder can be used with 10mm, 50mm and 100mm pathlength cells. The clear aperture is 19mm. It fits the 2” x 3” universal slide mount in all IR & FTIR spectrophotometers.