3M 10118, Synthetic Steel Wool Pads, 10118NA, #0 Fine, 7000126148 
Insize 4168-S1E, STEEL STANDARD BALLS, 6940561981384
$392.51
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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