Maxwell Anchor Swivel Shackle SS - 10-12mm - 1500kg. Thus they are highly recommended for use with Maxwell's automatic rope/chain series windlasses. Two sizes (6mm - 8mm/1/4" - 5/16" and 10mm - 12mm/3/8" - 7/16") are available to suit vessels up to 20 metres (65'). These robust single swivel anchor connectors with captured pins will not loosen under load and pull smoothly and easily over bow rollers. Specifications for Maxwell Anchor Swivel Shackle SS: Manufacturer: Maxwell Fabric/Material: Stainless Steel Color: Silver Features of Maxwell Anchor Swivel Shackle SS Boat Length - Max (Feet): 65 Construction: Stainless Steel Package Contents: Maxwell Anchor Swivel Shackle SS Maxwell P104371: Anchor Swivel Shackle SS - 10-12mm - 1500kg