Package content: 2 pieces of 41 mm black tripod quick release plates which are compatible with Ambico V-0550 V-0551 V-0552 V-0553 V-0554 (fluid type head only), Sunpak 7500 Pro 7500tm 7575, Kalimar Pro-Tech V-40, and so on | Good workmanship: the camera mount adapter plates are made of PVC material and the middle anti-twist locking screw is made of aluminum material; The surface is finely oxidized to give it a long service life, so you can use these camera mount adapter with confidence | Standard anti-twist locking screws: these ball head quick release plates are equipped with standard anti-twist locking screws which conform to international standards, compatible with the standard for camera tripod ball heads | Easy to install and remove: the quick release plates can be fixed to the camera base, which can save your time and facilitate the installation and disassembling of the tripod, easy for you to use | How to install: depending on the card position position of the Pan/ Tilt/ Zoom, you can insert the tripod quick release plates directly for installation; The quick release plates have a slotted screw that you can tighten with your fingers or coins