The Servo to Shaft Coupler (H25T Spline, 1/4-inch Bore) allows you to drive a 1/4 inch round shaft or 1/4 inch D-shaft with a 25 tooth spline servo. The screw that holds the coupler onto the servo needs to be installed first, followed by the 1/4-inch shaft to be driven. The M5 set-screw can then be tightened down with a 2.5mm hex driver for a tight hold on the shaft.
1x Servo to Shaft Coupler (H25T Spline, 1/4-inch Bore)