3M 10119, Synthetic Steel Wool Pad 10119NA, 0000 Super Fine, 7000126181 
Insize 4168-1E, STEEL STANDARD BALLS, 1/8″, 6940561981391
$10.48
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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