3M 65491, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc DUH5220TRI-10I, 5 inch UH, 220, 7100202878, 10 per pack 
Insize 6225-80E, UNIVERSAL DIAL INDICATOR STANDS (NON-MAGNETIC),
$236.55
Applicable holding stem 3/8″ DIA
Hardend base
Suitable for granite surface plates or ast iron surface plates
For electronic/dial indicators and dial test indicators
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