3M 10115, Synthetic Steel Wool Pads, #3 Coarse, 7000051986 
Insize 4168-19E, STEEL STANDARD BALLS, 21/32″, 6940561981575
$20.02
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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