Groovemasters

• Made in the U.S.A.
• Highly effective Caliper Attachment for quick, and accurate measurements of internal and external diameters of Retaining Ring grooves, O-Ring grooves and undercuts
• Available individually and in convenient sets
• Precision machined from steel, hard chrome plated for extra wear resistance
• Fits all 6″ Vernier, Dial and Digital Caliper with a maximum jaw-thickness of .140″
• Measures internal grooves from .200″ up to the capacity of the caliper