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Relay 5V 30A 1 Channel  Module with Optocoupler High Low Level TriggerThe relay module uses an authentic quality mechanical relay and the industry's top quality subminiature two-way isolation optical coupling which gives you the strong anti-interference ability, and stable performance.The user ..

These couplers allow you to connect a 1/4” shaft directly to your 24 Tooth (C1) Hitec servo spline. The set screw included with each shaft coupler works well with straight or d-shafts. These servo shaft couplers have a length of 0.5”, an outer diameter of 0.42”, and an inner diameter of 0.25”.Length..