Manufactured by Peter Lisand, and distributed by VF Gadgets and Upgrade Innovations, these mounts are rock solid. Machined out of solid aluminum, these can hold almost any type of monitor without slipping. Model number is MMS-06.

2 of the mounts have an extra axis of movement, and 1 is just a simple tilt.

2 are missing the 5/16" knob (the same knob used on most c-stands), but Upgrade Innovations sells replacements for $11.25. Upgrade Innovations are selling similar mounts for $216.