5 Stainless Steel Adjustable U-shaped Shackle, 1/2" of Adjustability, Type 316L (Marine Grade Steel), Perfect for Paracord Bracelets Bow diameter: 1/5" (5mm) Inside width : 7/16" (11mm) Diameter of each hole: 3/16" (4.7mm) Distance between centers of each hole: 1/4" (6.4mm) Shackle is capable of holding 500~650kg (1100 - 1430 lbs).