3M 16583, Accuspray Atomizing Head, Green, 1.3 mm, 7010309279 
Insize 4168-10E, STEEL STANDARD BALLS, 3/8″, 6940561981483
$14.21
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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