3M 78469, Cubitron II Depressed Center Grinding Wheel, T27, 4 in x 1/4 in x 3/8 in, 7100086893, 20 per case 
Insize 6311-20, MICROMETER SETTING STANDARD, 20″, 6928640351037
$89.84
Length 20″
Type B
Suitable for mechanical micrometers.
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