【Main Parameter】：Product: Ball vise. Material: Stainless steel. Ball diameter: 78mm (3 inch). Height: 85 mm (3.34 inch). Max. opening: 54 mm (2.13 inch). Base diameter: 98 mm (3.85 inch) 【Wide Application】： The full set standard block ball vise engraving setting tool is perfect for stone setting, small engravings, and other precision work. Designed for a unique combination of solid work support in a small and maneuverable size. Its low profile is suited for microscope work 【Rotational Brake System】：The internal rotational brake system lets the user choose the amount of rotational resistance from free to locked. There is a double ball bearing system for smooth rotation without looseness or wear inside 【Self-Centering Jaw System】：The mini ball vise has a self-centering jaw system made for stone setting, small engravings, and other precision work 【360 Degree Rotation 】：The spherical bottom sits in a socket ring so you can tilt it in any direction. Flexible operation 360 degree hemispherical rotation, fine workmanship, sensitive operation, Manufacturer: Pssopp