Concrete Mixer Spline Shaft This spline shaft sleeve is suitable for new or old mixer such as 1.5 square, 2 square, 3 square, 4 square, 4.5 square etc. It is suitable for M305, M306, M307, M309, M310, M311, M313 reducer spare parts.The spline shaft sleeve is installed between the reduction box and the main shaft which can connect the transmission transition of the main shaft and the gearbox and protect them. MaterialHigh chromium cast iron/steel useful LifeMore than 200000 cubic meter concrete or 300000 tons asphalt FinishZn- Plated,Ni-plated,Passivated,Tin-plated,Sandblast and Anodize, Polish,Electro Painting,Powder coating,Chrome plated, etc. Production WayCNC Milling, CNC turning, Grinding, Wire cutting, EDM,Drilling, etc. CertificationISO9001, 2008 / ISO9001, CEDurable Concrete Mixer Spline Shaft And Shaft Sleeve website:http://www.hwmparts.com/concrete-mixer-spare-parts/concrete-mixer-spline-shaft-and-shaft-sleeve/