This is 1/8" thick aluminum plate designed to support our IG32 motors. Use M3x8 screws to mount the motor to the plate. To mount the plate to the chassis, use the IG32 and IG42 Motor Plate Hardware Kit. This plate is used on all of our IG32 SB wheeled robot kits and can be used with our motor mount tube to mount a motor and shaft with a ball bearing. (These are not intended for our right angle gear motors, different adapter plates would be needed).