Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack) Robot kits They have a special profile

They have a special profile with rounded teeth which reduces slippage

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The following simplified truth table shows how the driver operates:

Any standard 2G SIM slides into a secure connector

Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack) Robot kits They have a special profileThese universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 4 mm diameter motor shafts. The set includes two hubs, two #4 40 set screws for securing the hubs to motor shafts, and one 0. 05 Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #4 40 screws (not included). These universal mounting hubs are designed to work with most 4 mm diameter shafts , including round shafts, and D