3M 58207, Dynamic Mixing System Nozzle Extension, 12 per bag, 7000120110 
Insize 4799-1300, PROTRACTOR, 11.8×19.7″, 0-180?, 6928640317439
$108.59
Graduation 1?
Made of carbon steel
Satin chrome plated scale.
With clamping screw.
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