These MAXPlanetary Input Couplers are compatible with the REV ION System. The MAXPlanetary 1/2in Hex Input Coupler attaches to the end of a hex shaft, securely held in place by a screw, enabling the MAXPlanetary to be powered by a hex shaft on its input side. Its significance lies in its compatibility with various products, notably the 2 Motor Gearbox - Through Bore and the MAX 180 Degree Gearbox, all designed to drive the MAXPlanetary. Typically paired with a hex shaft, this coupler adapts to products with a socket or through hex output, ensuring seamless compatibility in your setup.
The MAXPlanetary Falcon Spline Input Coupler allows users the ability to use Falcon 500 motors with the MAXPlanetary System without having to modify the shaft of the Falcon 500. The MAXPlanetary Kraken X60 Input Coupler allows users the ability to use Kraken X60 motors with the MAXPlanetary System without having to modify the shaft of the Kraken X60. 
*Please note that using a 1:1 (no cartridge) requires modifying the length of the motor shaft for the NEO 1.1, Falcon 500, and Kraken X60. A single cartridge reduction setup will still require modifying the Kraken X60 shaft to prevent damage to your motor.