3M 26135, PPS Series 2.0 Adapter, Type S40, Trapezoidal Thread, 7100135335 
Insize 4799-1150, PROTRACTOR, 5.9×7.9″, 0-180?, 6928640317415
$53.38
Graduation 1?
Made of stainless steel
Satin chrome plated scale.
With clamping screw.
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