4M Spur Gear Process Hole 4 Mod Pinion Gears 10 11 12 13 14 15 16 17 18 19 20 21-80 Teeth Flat Cylindrical Motor Tramission GearHome Improvement > Hardware10,80 USD (≈ 9,67 €)DisponibileSold by AliExpress WWVai al negozio