Gauge Ring Half Round 3mm

Size: 1½ to 3⅜”; Reversible 1 - 27

Holes are used to measure stones and extensions are used to measure mountings. Gauge has mm and carat measurements.

For measuring diamonds and stones. Capacity 0.10 to 4 carats

Carbide tipped measuring faces parallel, ground and lapped. Stainless steel spindle for rust prevention, heat resistant grips and calibration is laser etched.