1. With worm gear and shaft structure to adjust up and down. 2. The elevator column with protective cover is waterproof and dustproof. 3. Has a circular bubble on the flat head. 4. Has removable chains to prevent legs from sliding. 5. Quick release clamp for option. 6. Closed length: 137cm, opened length: 235cm(include 32cm for central column) 7. Adjustable range of central column: 32cm 8. Size of tripod head: 13.4cm 9. 5/8?? thread 10. Net weight: 7kg