Designed for a unique combination of solid work support in a small and maneuverable size. The self-centering jaw system is perfect for stone setting, small engravings, and other precision work. An adjustable internal brake system lets the user choose the amount of rotational resistance from free to locked. Its low profile is suited for microscope work. Package includes 4 pins, 2 wrenches, 6 screws, plastic base, 1 plastic hex key, and Thermo-Loc Sample Kit. Weighs 4.9lbs. Ball diameter: 3.1". Jaw width: 1.8". Jaw Height:0.87" Max. Opening: 2"