3M 29860, Sanding Screen, 120 grit, 12 in x 18 in, 7100160860 
Standard Abrasives 713066, PSA A/O Disc, 8 in x NH, 60, 7010370082 
Insize 4168-19E, STEEL STANDARD BALLS, 21/32″, 6940561981575
$20.23
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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