These commerical grade shackles are for general purpose applications. They are mild steel and carry "No Load Rating". As with most chinese factories who manufacture this product the tolerance are lose and can differ generally by 1.0mm

Full Box Quantities

5mm / 2000,   6mm / 1000,    8mm / 500,    10mm / 200,    12mm / 100,

16mm / 50,   20mm / 25,   25mm / 10