Chain Mail Square PieceChain mail square piece (15", 37.5cm), ID 5.4mm, This chain mail is made of round, butted rings. Their blackened surface provides some protection from corrosion. We call this type of chain mail Butted Mild Steel Blackened. This square piece is used to repair, lengthen or producing your own, custom-made chain mail. We also offer loose rings.Details: Larger edge rings attached per cornerRing thickness 1.20mm, however, this is flexibleOD - 10mm , ID 7.6mm Size: approx. 37.5cm x 37.5cmInterior diameter: 5.4 mmRing thickness: 0.8 mmWeight: approx. 443 gmOuter diameter: 7.0 mm