3M 10119, Synthetic Steel Wool Pad 10119NA, 0000 Super Fine, 7000126181 
Insize 4168-18E, STEEL STANDARD BALLS, 5/8″, 6940561981568
$20.16
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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