Reliably ensures effective anchoring by allowing anchor chain to swivel Prevents chain and anchor rope from getting twisted Lessens effects of lateral forces that can stress anchor connection to chain or chain to anchor line Corrosion-free reliability from 316 Stainless Steel construction Measures 4 5/8 Inches Long, with 7/8-Inch Anchor Side opening and 1/2-Inch Chain Side opening Manufacturer part number 50-44511