Trek-Tech MagMount Pro Magnetic Quick-Release/Quick-Mount Ball Head Assembly with Attached Safety Clip Magnetic quick-release/quick-mount system for attaching cameras, spotting scopes, and more Rear earth neodymium magnet connect system holds most large digital SLR cameras Industry-standard 1/4-inch-20 mounting stud; offers pan, tilt, and swivel options Includes attached safety clip and 2 MagAdapters for connecting lightweight or heavy devices Anti-rotation feature locks scope in place; lifetime warranty