3M 10120, Synthetic Steel Wool Pads, 10120NA, #000 Extra Fine, 7000126149 
Insize 4168-7E, STEEL STANDARD BALLS, 9/32″, 6940561981452
$13.59
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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