Forged from stainless steel, the Harken 8mm High Resistance "D" Shackle boasts a polished, lustrous finish and is imprinted with the screw pin diameter. Made from 17-4PH stainless steel, these High-Resistance (HR) shackles can withstand heavy loads and feature an "HR" marking for easy identification. With a shackle pin of 8mm / 5/16in, this shackle weighs 56.5g / 2oz and has a maximum working load of 2330kg / 5130lb, with a breaking load of 4650kg / 10260lb. Specifications are subject to change.