ITEM NAME:5/6mm D Ring Shackle Boat Anchor Shackle 304 Stainless Steel Chain Shackle Description: Made of 304 marine stainless stell for long life, durable to use. Strong corrosion resistance and oxidation resistance, Suitable for freshwater and seawater. Professional boat, pool, outdoor climbing, architecture accessories. Can be used for anchor chain, towing, sailing hardware. Simple design, easy to install. Specification: Material: 304 stainless steel Size Chart: Size Length Width Diameter M5 20 12.5 5 M6 24 15 6 Unit: mm (1mm=1/25 inch) Package Includes: 2 Pieces Stainless Steel D Shackle Note: Please check as much as possible to make sure the item is the one that you need. Please allow 0.5-1 inch difference due to manual measurement..2 Pieces Stainless Steel D Shackle. Professional boat, pool, outdoor climbing, architecture accessories. Can be used for anchor chain, towing, sailing hardware. Material: 304 stainless steel. M6 24 15 6.