Precise External Groove-Master #5

Quick & Accurate! Measure Internal And External Diameters of Retaining Ring Grooves, O-Ring Grooves & Undercuts.

• Machined from steel and hard chrome plated.
• Fits all 6″ Calipers with maximum jaw thickness of .140″.
• Measure internal grooves from .200″ up to the capacity of the caliper.
• Metric sizes are also available.
• Caliper not included.