Thorlabs KMSS Low-Profile Compact Kinematic Mirror Mount, very good condition
Thorlabs part number KMSS. The length of the adjuster makes attaching a knob to the adjuster impossible, so a HKTS-5/64 hex key knob or 5/64″ hex key must be used to adjust the mirror mount. This mount has two 8-32 threaded holes that enable horizontal or vertical mounting.