Mainly used in hollow cup.130.140.180.260.280.370 and other 2MM motors, 2.3MM round shaft motors, 3mm D-axis geared motors, 4mm D-axis geared motors, etc. It contains various apertures of 0.8-3mm, including spindle gears, plane gears, crown gears, worms and other different types of gears.
eBay