Detailed Product Description Yacht drive axle1)Material:40Cr etc.2)Heat Treatment:thermal refining, high-frequency quenching, 4)surface roughness:0.4,0.85)Hardness: HRC45~506)Packing:Packed in inner box bubble separately, puted in carton, and then puted on pallet. The customer's requirement is also available.Welcom to make an inquiry, and we will give you the best price.