Product information "Pololu 20D mm Metal Gearmotor Bracket Pair"
These light-weight brackets (under 5 g each) are specifically designed for our 20D mm metal gearmotors. Each bracket features three mounting holes and ten mounting slots (five along each edge) for M3 or #4-size screws, giving you a variety of mounting options. A total of four M2.5 screws (two for each bracket) are included for securing the motors to the brackets.
Our 4mm mounting hubs works nicely with this bracket.
Mechanical drawing for the Pololu 20D mm metal gearmotor bracket. Units are mm over [inches].