OptoSigma mirror mounts feature a hollow-frame design
The MHX Series stainless-steel mirror mounts are designed for use with standard 25.4 mm mirrors. The holders feature a hollow-frame design that provides higher moment of inertia to maximize stiffness. They have reduced mass sections, allowing them to reach thermal equilibrium faster than traditional mounts. They have center-post mounting, adhesive wells, and keying pin slots.
OptoSigma
Santa Ana, CA
survey.optosigma.com/assets/MHX.pdf
(Editor's Note: On March 10, 2020, OptoSigma announced that it has completed registration with the U.S. Directorate of Defense Trade Controls (DDTC) for compliance in International Traffic in Arms Regulations [ITAR].)