Dynabrade 15030 Contact Arm Assembly, 5/16" Dia. x 3/8" W, Steel Wheel, with 1/2" W Platen 
Insize 3294-1, NON ROTATING SPINDLE DISK MICROMETER, 0-1″, 6928640328152
$264.28
Graduation .0001″.
Measure root tangent length of gear.
Non-rotating spindle.
Ratchet stop.
Supplied with setting standards
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