1. The top is a 1/4inch inch standard screw hole, and the bottom is a 3/8 inch standard l standard mounting interface to facilitate the connection of photographic accessories to the camera. Suitable for all types of photographic equipment2. Made of high-quality materials, -duty, durable and safe, suitable for all kinds of equipment.3. The mini tripod head can be connected with smartph ckets, cameras, etc. through 1/4 screws.4. Comes with a 3/8 threaded hole, suitable for direct connection to a tripod or monopod.5. Support multiple angles, with locking knob to meet your different needs.6. The compact size and lightweight design make it easy to use, carry and .Product name: tripod ball headBottom diameter: 34mmHeight: 57mmBall diameter: 25mmInterface taps: 1/4 inch, 3/8 inchMaterial:Aluminum alloy + stainless steelcolour:Black + RedPackage Contents:1 x Tripod ball head1 x 1/4 to 3/8 transfer screwOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.