10 piezas engranajes de husillo de plástico de 14 dientes para modelo de eje de 2 mm robot motor caja de cambios juguete
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: 1.95mm (fit 2mm shaft tightly).