3M 65490, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc, DUH580TRI-10T, 5 IN x UH, 80, 7100202914, 10 per pack 
Insize 4790-3000, 90? BEVELED EDGE SQUARE, 11.8×7.9″, grade 0, 6928640317705
$269.53
Satin chrome plating.
Beveled edges for inside and outside measurement.
Made of hardened stainless steel.
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