If you have ordered V4 Arrma Screw Adjust Motor Mount in only 25mm or 30mm, and decided you want to change your motor size, OR if you want a spare plate to leave on your motor for quicker swapping between motors, this is what you want.
This is a replacement mount insert. The hardware is very easy to interchange between mount plates, and is not included at the base price. Instead of flat out charging $25 per insert, I am giving you the option for a bare plate for $10 less. If you would like to add the hardware (The adjuster plate and the adjuster nut, plus the screw and washer), there is an option for that.