3M™ 17379, Versaflo™ Length Adjusting Breathing Tube BT-30, 7100009685, 1 EA/Case 
Insize 7382-112, 3-WIRES, .0352″/0.895mm, 6928640361814
$321.46
Used with standard outside micrometers with spindle .25″DIA to measure pitch diameter of screw threads.
Diameter accuracy: ?20_in. Cylindricity: 39_in.
Hardness: HRC60.
Supplied with manufacturer inspection certificate.
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