Bore size for both gears is 5mm; Material: Hardened steel ; Package: 1pcs high quality pulley with set screw, 1pcs high quality pulley without screw, 2pcs m3nS nuts, 1pcs M3X20 shaft, 2pcs bearings .
This is an all-steel one-piece machined integrated filament driving gears, More sturdy , longer lifetime
Compatible with Prusa i3 MK3 MK2/MK2S/MK2.5 MK3S MK3.5S 3D Printer
The Drive gears are made from Hardened steel material. After heat treatment,,hardeness reach 55HRC, with high precision.
Material : hardened steel, black treatment to advoid rusting