Rhino-Rack Heavy Duty Fit Kit for Hybrid Bike Carrier

Not sure but it works on my Rhino kayak rack.

yes it is an allen key with hole in center. Works for Rhino rack

It is not a torque key. Be mindful though. It is a special key specifically for rhino hex screws. It has a hole in the center of the key so you can’t just use any hex key to remove the screw.