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It includes 5pcs a5 size 3 D ring mechanism;
A5 size 8.25inch =210mm oveall length,2 side holes distance: 198mm,ring distance: 70mm/70mm=2.75/2.75inch
Ring inner height: 0.75inch=20mm, base width:0.75inch=20mm
Weight: about 1.4oz=40g/pc
Iron material,nickel plated
3 D ring mechanism for a5 size, Overall length: 8.2 Inch Ring distance : 2.75/2.75 Inch Ring inner height: 0.8 Inch=20mm, Base width: 20mm=0.8 inch Surface Treatment It was nickel plated,the color can last a long time . Material Iron material,it's durable .