Description: Marine grade stainless steel construction Corrosion resistance and durable For 6-8mm (1/4" - 5/16") chain Dimension: Approx. 4.7" x 2.6" / 12 x 6.7cm Used to tie chain to a cleat or remove tension from a windlass Package Includes: 1 Piece Boat Anchor Chain Lock Note: Please allow slightly difference due to manual measurement. Color maybe slightly different since different monitor. Thanks!