Used for marine boat propeller,ship propeller Fixed pitch propeller Material,Cu1,Cu2, ... ,Cu4 Approved by ABS,BV.CCS,GL,LR, SpecificationsUsed for marine boat propeller,ship propeller Fixed pitch propeller Material,Cu1,Cu2 ... ,Tunnel thrusters,Azimuth thrusters,Water jets,also Main propulsion assembly. marine propeller blade