From Manufacturer
The Manfrotto 612 Nitrotech Fluid Head with 645 FAST Twin Aluminum Tripod System and Bag combines the innovative Nitrotech 612 fluid head with the two-stage aluminum FAST Twin tripod legs and mid-level spreader, creating an effective combination of stability and smooth, precise control. The legs feature a 100mm half ball with a removable 75mm adapter that permits the mounting of the 608 head. The head features variable pan and tilt drag with independent locks and continuous counterbalance from 8.8 to 39.7 pounds.
The aluminum legs are durable, strong, and feature the Ultra L-Lock that enables you to lock and unlock the legs using only one locking lever located at the top of each leg, so you don't have to bend down to unlock the legs. The legs feature three locking positions for spreader-less operation, or you can use the included mid-level spreader with the legs set to free movement. Included with this system is a padded carrying bag for storage and transport.