3M 05699, Hookit Foam Hand Sanding Set, 7000045514, 20 per case 
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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