1Wide Application: Anchor chain swivel connector is suitable for 3/8in ? 1/2in (10?12mm), can be used in most boats marines, yachts, etc. 2High Strength Material: The anchor swivel connector is made of 316 stainless steel, with mirror polished surface and 9000lbs working load, which is not easy to deform and rust. 3Heavy Duty Connecor: These double swivels are forged from solid stainless steel and have excellent mechanical properties in commercial marine applications. 4Double Swivel: The double rotation design allows the rotary connector to rotate in two directions, around the axis and horizontally or vertically. 5Oval Shape: The heavy duty ship or yacht anchor swivel connector is designed as an oval shape, which can slide perfectly in the roller.