3M 65489, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc, DUH5120TRI-10T, 5 IN x UH, 120, 7100202877, 10 per pack 
Insize 4791-501, 90? FLAT EDGE SQUARE (DIN875 grade 1), 2.0_1.6″, 6940561964530
$16.03
Made of hardened stainless steel.
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