a motor guard and landing gear set designed for the ZMR 250 arms. opening for the motor is 25mm. M3 x 8 screws hold bottom pate in place. alternatively you can glue them together... The holes are designed to be threaded when you put the screw in. dont over tighten or they will strip.. snug them up till the gap closes and they should be fine. UPDATE added a version for smaller arms... apparently both of my ZMR 250's have slightly different sized arms. hopefully one of the 2 tops fit nicely for you UPDATE I dont have 2206 motors.. someone please test the "27 mm guards" and comment how they fit. Thanks.