Descriptions of Bona JZM500 Concrete Mixer: JZM series mixer is a gravity type of double-conic reversing drum concrete mixer, the drum transit by gear or friction wheel, the drum rotates clockwise during mixing and anti-clockwise during discharging. It is portable and movable. The mixer can mix plasticity and damp half-dry concrete. These mixer services for ordinary construction site, roads, bridge projects and precast plant. â– Features of Used portable concrete mixers: 1.Bona JZM series concrete mixer is a gravity type of double-conic reversing drum concrete mixer, the drum transit by gear or friction wheel, the drum rotates clockwise during mixing and anti-clockwise during discharging. 2.It is portable and movable. 3.The mixer can mix plasticity and damp half-dry concrete. 4.The JZM series concrete mixer can be used in mixing dry hardness, plastic light aggregate concrete with ash, lime mortar widely used in building sites, road, bridges and concrete component factories.