RCT 3.2 to 5mm Motor Shaft Sleeve Adapter w/ Hardware 3pcs - RCTEF021A1

There's not a huge selection of 1mm pitch pinion gears for a 3mm motor shaft, improve your chances of finding the right pinion gear for you with one of these motor shaft adapters and turn your 3.2mm motor shaft into 5mm. Comes with three 3mm grub screws and a 1.5mm allen key for installation.