MHZ 8mm - 1/4" Square drive coupler. Many of the RTR gas boats come with a square-ended 1/4" (6.35mm) flex cable. This coupler comes in handy when trying to convert one of those gas boats to Brushless electric power. Specs: 8mm on the motor end for Motors with 8mm Shaft.250 (6.35mm, .250") square ended flex cables.
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