Compatibility and application Tripod boom arm: equipped with 1/4 and 3/8 screws, compatible with most ball heads, tripods and cameras. The extension arm is compatible with all 3/8 inch (approximately 1.9 cm) interface tripods. You can mount a 3/8 inch (approximately 1.9 cm) ball head or 1/4 inch (approximately 0.6 cm) camera on the extension arm. Can be rotated horizontally and vertically, multi-angle tripod center column: 360 degree rotation horizontally, 180 degree vertical rotation, you can keep your camera at the height and angle you like to meet your needs. Very suitable for studio/outdoor macro shooting and low angle shooting. Load-bearing capacity Tripod extension arm tube: sturdy structure and screw knob locking system can ensure a load of 5 kg; with sandbag hooks, it can withstand more stability (not including sandbags). The maximum extension length of the center column is 330 mm, and the diameter of the center column tube is 25 mm. The weight is only 465 grams. Easy to use: mount the base on a tripod and mount the camera or ball head on the side. The built-in bubble level allows you to precisely adjust the angle. The screw knob locking system makes the operation easier and faster. The function of the BA-25 tripod arm center column: suitable for shooting outside the tripod axis, for example, starting from the above, it is very suitable for outdoor macro head-mounted shooting in the studio. colour:Black Material:metal Package Contents: 1 x Camera Tripod Extender Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.