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Fits 1.5mm motor/gearbox shafts. Mounts GWS HD and other props with 4mm bore perfectly. Locks on with set screw. Socket head fastener & aluminum washer holds prop onto 4mm boss. Requires (not included) .89mm wrench. If you don't have one, order part number RRCLWHK below.
 "1.5mm Prop Adapter to 4mm Boss")