Used in engineering machine shops and engine building processes in conjunction with micrometers to accurately measure inside holes or bores from small to large diameters. Can also be used to help diagnose “out of roundness “of bores.

FEATURES:

• Stainless satin hardened chrome plated steel construction 
• Knurled handles for secure grip 
• Uniform spring tension, self-cantering plungers for accurate readings
• Contact point precision ground and hardened 
• Supplied in soft plastic pouch to prevent corrosion damage and provide safe storage when not in use