ITEM NAME:2 Pieces 3/8 Stud to 1" Ball Adapter for Underwater Camera Diving Photograph Description: Suitable for diving housing or other accessories with 3/8†screw hole. 1" ball adapter with 3/8-16 stud. Connect two ball adapters with one clamp to make a basic arm. Strong, lightweight, waterproof aluminum construction. Part of the Workhorse Arm expandable, adaptable, universal mounting system. Specification: Material: Metal Size: Approx. 3.1 × 1 × 1 inch Packaging Material: Transparent Bag Length: 3"/7.8cm Mount Screw: 3/8†Package Includes: 2 Pieces Male 3/8" to 1" Ball Adapter Note: Please allow a slightly errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understanding and attention..Suitable for diving housing or other accessories with 3/8†screw hole. 1" ball adapter with 3/8-16 stud. 2 Pieces Male 3/8" to 1" Ball Adapter. Connect two ball adapters with one clamp to make a basic arm.