Additional information: Type of Link: Chain Key: Standard Construction: Riveted Mechanism: Double lock treated Toothed: Double Weight: 318 grs Length: 238 mm Minimum opening: 50 mm Minimum inside perimeter: 165 mm Maximum inside perimeter:200 mm Locking Position: 20 Material: Steel K-60 Hardness: Rockwell B HRB-92 Thickness folded: 20 mm Certified: NIJ Standard — 0307.01