3M 35831, Hookit Dust Extraction Flexible Radius Sanding Block, 178 mm x 66 mm, 7100256512 
Insize 4801-16E1, RADIUS GAGE, 17/32″-1″, 6928640330070
$26.25
Radius Gage Set Range 17/32″ to 1″
16 Internal Leaves and 16 External Leaves
Accuracy +/- .0017
Made of medium carbon steel
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