Features:
- For use with V-anvil and conical spindle inserts for measuring pitch diameters of screw threads (sold separately)
- Vernier scale in inch units for taking precise outside diameter (OD) measurements
- Ratchet-stop mechanism helps provide uniform pressure for precise, repeatable measurement
- Satin chrome finish on thimble and sleeve helps resist rust and reduce glare
- Hammertone, baked enamel finish for protection and durability of frame
