Product: Ball vise Material: Chrome steel Ball diameter: 78mm (3 inches) Height: 100 mm (3.93 inches) Max. opening: 85 mm (3.35 inches) Gross weight: 2.16 kg (5.73 lbs) Base diameter: 98 mm (3.85 inches) Product: Ball vise. Material: Stainless steel. Diameter: 5" (130 mm); Jaw Width: 2.5" (64 mm) 2-1/2 (64 mm); Jaw Height: 1.5" (38 mm) 1-1/2 (38 mm); Max. Opening: 3" (76 mm). Full set standard block ball vise engraving tool: This block is made of solid galvanized steel, comes with a brake which allows you to control the rotational resistance. The mini ball vise has a self-centering jaw system made for stone setting, small engravings, and other precision work. 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. The engraving ball vise 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.