Product Description:
includes different gears, all of which can be compatible with each other,
module 0.5,
inner hole 1.9 mm, 2.05 (2.0) mm, 2.4 (2.55) mm, 2.9 (3) mm etc.
It also includes hex gears, racks, pulleys, belts, axles, and other DIY accessories.
Gear diameter calculation formula: gear outer diameter (end circle) = (number of teeth + 2) * module