Shackles are classified by the diameter of the metal in the bow.  The thicker the material, the stronger the shackle.  The bow shackle has a larger "mouth" than the "D"-shackle.  With a larger "O" shape to the loop, this shackle can take loads from many directions without developing as much side load.  While these shackles have many uses, they're great for making stylish paracord bracelets.Bow diameter: 5/32" (4mm)Inside width : 1/2" (12mm)Outside width: 3/4" (20mm)Outside height: 7/8" (24mm)Inside height: 1/2" (13mm)Throat: 5/16" (9mm)Pin: 15/16" (24mm)