Forged stainless steel shackles are polished to a high luster and are stamped with the screw pin diameter.Large open shackles have a similar shape to "D" shackles but are proportionally wider for their length. 5mm Specs: Shackle pin Ø (mm)5 mm Weight (g)25g A (mm)33mm B (mm)20 mm Maximum working load (kg)350kg Breaking load (kg)1000 kg