Description

The TUNA Microblock with Inside Ring Holder Set is a precision stonesetter’s vise designed for professional and student jewelers alike. Built with a matte stainless steel finish and smooth ball-bearing rotation, this microblock provides stable 360° access to your work under a microscope or magnifier. Comparable systems cost hundreds more, making the TUNA an exceptional value in precision holding tools.

Key Features
18-piece expandable collet set holds rings from size 4 to 16 (15mm–25mm ID)
Compact 3.5″ (90mm) diameter microblock for detailed stonesetting and engraving
Matte stainless steel construction resists glare under bright lighting
Precision ball bearings ensure smooth, even rotation
Self-centering jaws maintain secure, even pressure on your workpiece
Compatible with microscopes, GRS systems, or magnifiers such as Optivisors

Specifications
Overall Diameter 3.5″ (90mm)
Height 3.5″–5″ (90mm–130mm)
Hole Count 18 holes, 3.7mm diameter; 6 threaded
Collet Range 5/8″–1″ (15mm–25mm)
Max Jaw Opening (Using Pegs) 2.88″ (72.5mm)
Weight 4 lbs (1.8kg)

What’s Included
1 TUNA Microblock (matte stainless steel)
18-piece expandable ring collet set
4-piece peg set
6 hex nuts
2-piece hex key set