[COMPATIBILITY] Replacement 1/4-20 Mounting Knob for Zeadio, Neewer, Opteka, Ulanzi U shaped camera handle smartphone grip mounts The ¼”-20 Mounting Knob is constructed from composite thermoplastic and steel to ensure your camera and accessories are securely fastened. The ¼”-20 post ensures all cameras with a standard tripod mount will fit. Can be used as a replacement knob to attach your camera to the Scorpion JR Have a spare on hand in case you lose your mounting knob at a crucial moment. (1) Large Washer and (1) Small washer are included. The 1/4"-20 threaded Accessory Knob can be used in a variety of ways. It can be used as a replacement knob to attach your camera to your Scorpion JR or similar camera handle. It can also be combined with our Accessory Wing to mount multiple items to your rig. Our unique design provides a great deal of flexibility ensuring you can always customize your gear to fit your production needs. Keep a spare on hand and always be prepared. Works with Zeadio, Neewer, Opteka, Ulanzi, Polaroid and many other U-Shaped stabilizing Camera Handles.