Description: 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 Works with 1-inch ball clamps and accessories from Ultralight, CamDive, Meikon, Ikelite, TLC, Nauticam, and others Specification: Material: alloy Size: 3.1 x 1 x 1 inches Package Includes: 1Piece Male 3/8" to 1" Ball Adapter