20pz 10 Denti 0,5 Modulo Mandrino Ingranaggio Motore Plastica Ingranaggi per Albero 2mm Fai da Te Giocattolo
Suit for a science DIY projects such as rc model car, model electric robot and windmill, education such as displaying how gear rates work, and any other family small motor DIY project. Hole: 2mm (fit 2mm shaft tightly).