Plastic Rings Gauge Set of 15

Gauge will measure diameter and circumference in mm and inches.
Hollow cavity to store work tools like files, tweezers, gauges, etc.

K&B Diamond and Stone Gauge.
Measures loose or mounted stones from 3 points to 4 carats.
Birthstone chart on reverse.

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

15mm Capacity; Graduations 1 to 10mm;
Throat 20mm.