3M 29825, Sanding Screen, 60 Grit, 20 in x NH, 7100160253 
3M 14215, Roloc Disc Pad TS and TSM, Medium 3 in 1/4-20 Internal, 7000119310 
Insize 4168-4E, STEEL STANDARD BALLS, 3/16″, 6940561981421
$12.19
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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