Precise Interchangeable Anvil Thread Micrometers

• Direct reading of pitch diameter in threads 7-11, 12-18, 20-28, 30-44, 48-64, 20-28, 30-44, 48-64 TPI with interchangeable anvil and spindle pairs. 
• Ratchet stop. 
• Fitted case. 
• Micro fine slant line graduations. 
• Anvils and spindles made of tool steel, hardened and ground. 
• Kit includes Screw Thread Micrometer and 5 pairs of anvils & spindles.