Dynabrade 10690 Filter/Regulator/Lubricator, FRL40, 1/2" NPTAssy. 
Insize 4168-25E, STEEL STANDARD BALLS, 15/16″, 6940561981636
$22.88
To measure angle and diameter of taper holes
Material: tool steel
Hardness: HRC63
Diameter accuracy:?.00012?
Roundness .00004″
Supplied with manufacturer inspection certificate.
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