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Radical RC Radial 20mm Motor Mount & Prop Shaft Adapter 3.0/3.2mm
Radial Mount for 20mm, S-200-400 and some outrunner motors. Mount sizes all same, difference is shaft diameter. Choose your shaft diameter and color below. Mounting bolt circle is 1.296" (33mm), Motor holes are one pair at .625 (16mm) on center, other pair at .750" (19mm) on center.
 "Radical RC Radial 20mm Motor Mount & Prop Shaft Adapter 3.0/3.2mm")