Pololu Universal Aluminium Mounting Hub Shaft
Pololu Robotics & Electronics | A-000000-00379
The Pololu Universal Aluminium Mounting Hub Shaft allows you to attach wheels or other mechanisms to 4 mm motor shafts. It provides two mounting hubs along with two 4-40 screws and the corresponding Allen wrench to secure the hub to the motor shaft. Each mounting hub has 4 holes for 4-40 screws (not included) that can be used to attach a wheel.