Andrews Glass Co. offers half-moon- shaped glass rods designed as supports for fiber optic couplings. Made of borosilicate glass or quartz, the rods are suitable for fiber optic fusion splices. Customized grinding and polishing specifications are offered using concentric, centerless or surface grinders. The company achieves tolerances up to 0.0005 in. in concentricity and 0.0001 in. in diameter.