3M 65487, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc, DUH560TRI-10T, 5 IN x UH, 60, 7100202913, 10 per pack 
Insize 4812-12, THREAD GAGE, 2-12mm, 6928640319327
$31.09
To check and set screw cutting tools.
Angle accuracy: ?10min.
Thread Type Tr 30 Degree
2-12mm, Pitch: 2,3,4,5,6,7,8,9,10,12,mm
Made of medium carbon steel
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