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138a aluminum 138g galvanized gravity roller conveyor rollers 1-38 dia. x 18 ga. tubing available in heat treated alum. model 138a or galv. steel model 138g both with smooth swaged ends. roller capacity is 35 lbs. for 138a 50 lbs. for 138g.axles 14 dia. galvanized steel shaft spring loaded.frames formed heat treated aluminum channel..