3M 88906, PSA Cloth Disc 348D, 36 X-weight, 12 in x NH, Die 1200B, 7000118898 
Insize 4168-22E, STEEL STANDARD BALLS, 3/4″, 6940561981605
$20.39
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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