4:1 low ratio steel gearboxes for Heng Long 1/16 scale M41A3 Bulldog RC tank. Gears are made of steel, providing extra strength than normal metal gearboxes made of zinc alloy. Designed for heavy duty!
Note: the sprocket screws (included) are bolder than standard Heng Long screws. Some modifications of Heng Long sprockets are needed to fit the drive shafts of this item.