Forged stainless steel shackles are polished to a high luster and are stamped with the screw pin diameter.Bow shackles are best for multidirectional loads. Shallow bow shackles are proportionally wider for their length than regular bow shackles. 4mm Specs: Shackle pin Ø (mm)4 mm Weight (g)8.5 g A (mm)16 mm B (mm)8 mm C (mm)11 mm Maximum working load (kg)367 kg Breaking load (kg)735 kg 5mm Specs Shackle pin Ø (mm)5 mm Weight (g)14.5 g A (mm)17 mm B (mm)11 mm C (mm)14 mm Maximum working load (kg)540 kg Breaking load (kg)1080 kg