The MMS 15mm Non-Twist Mounting Spud can be mounted via the M5 thread found on all of our latest Monitor Mounts. Mounts via 5/32 or 4mm Hex Key. Once mounted to Monitor Mount, the top of the 15mm Mounting Spud also provides a 3/8 tapped thread for mounting accessories. Spuds come with captive and friction o-rings to keep accessories in place while adjusting or loosening. This accessory works great with our Rudy Arm system or for using existing gear already in your kit.