SPI 30-485-7 Groove Master Attachment, 3.15 mm

Features:

• Highly effective caliper attachment for quick and accurate measurements of internal and external diameters of retaining ring grooves, o-ring grooves and undercuts.
• Precision machined from steel, hard chrome plated for extra wear resistance.
• Fits all 6" vernier, dial and digital calipers with a maximum jaw-thickness of 0.140".