The HVM-1t is a vertical drive optic mount specifically made for thin 1-in. optics. The mount uses a threaded retaining ring to secure optics having a thickness of 6.2 mm or less. Also included with the mount is a 0.5-mm thick Delrin washer to protect the optic from damage during tightening of the retaining ring. The HVM-1t also features a rear-loading design to ensure the front face of the optic is always in the same location regardless of its thickness. The mount has standard features like a 1-in. optical axis height, 80-TPI hex key locking actuators, and an exceptionally thin 16-mm profile. The HVM-1t is designed with several mounting options including a center clearance hole for #8 or M4 screws, two #8 threaded mounting holes and two M4 threaded mounting holes.