3M 80131, Flexible Diamond Hand File Set 6210J, M74 Mic, 7000082153, 5/Carton 
Insize 4168-14E, STEEL STANDARD BALLS, 1/2″, 6940561981520
$20.47
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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