3M 26137, PPS Series 2.0 Adapter, Type S41, Trapezoidal Thread - QCC, 7100135947 
Dynabrade 13016 Arbor Assembly 1/2"-20 Female Thread - 1/2" Male Thread 
Insize 4799-1300, PROTRACTOR, 11.8×19.7″, 0-180?, 6928640317439
$107.44
Graduation 1?
Made of carbon steel
Satin chrome plated scale.
With clamping screw.
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