0.42" (10.8mm) groove ideal for 5/16" and 1/4" chain.base width: 53.5mm / 2.1", base length: 59.5mm / 2.34", height is 48mm / 1.89"316 heavy duty stainless steelwith quick release pin316 Stainless Anchor Chain Stopper 5/16" 1/4" Chain$15.00PriceQuantity*Add to CartBuy Now