The Oyster case of the Replica Rolex MILGAUSS guarantees water resistance to a depth of 100 meters (330 feet), making it a model of ruggedness and durability. The unique middle case is cast from 904L stainless steel, which is extremely resistant to erosion. The triangularly pitted case back is screwed on with exclusive tools from Rolex watchmakers, making the case completely airtight. The winding crown is water-resistant, features a double-buckle locking system and is screwed securely to the case. The completely sealed case of the Rolex MILGAUSS Replica Watch provides maximum protection for the highly accurate movement from humidity, dust, pressure and shocks.