The newly designed FEISOL CT-3371 tripod is our larger size tripod.  It has a maximum leg tube diameter of 37mm.  It's very sturdy even when loading larger photo/video equipments.  We also add an angle lock between tripod base and leg, so user can quickly adjust the leg angle into 25/75/90 degrees by push button operation.  CT-3371 can be functioned in different combinations:  with simply a ballhead mount, or a center column for additional height, or a level base.The specification and dimension of our leg tubes are very precise that, when extending out or pushing in leg tubes, air can form an airtight chamber inside the leg tubes and make it hard to push in or pull out. Therefore, when extending or collapsing leg tubes, it will take a few seconds to counter air resistance.