3M 65491, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc DUH5220TRI-10I, 5 inch UH, 220, 7100202878, 10 per pack 
Insize 4790-0300, 90? BEVELED EDGE SQUARE, 11.8×7.9″, grade 00, 6928640317637
$281.61
Satin chrome plating.
Beveled edges for inside and outside measurement.
Made of hardened stainless steel.
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