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Its 0.67 inch diameter hardened steel body resists cutting, sawing and prying. Ideal for securing bikes on campuses, in high crime areas and more. Environment Protection PVC Coating It is safe and non-toxic, also helps protect the paint and finishes on bicycles and an array of other sports equipment. Specification: U Lock Material: Heavy Duty Hardened Steel + PVC Coating; Lock Core Material: Zinc Alloy + Copper; Security Level: 4 out of 5; Steel Diameter: 0.67inch; Inside Product Size: 13.8 inch * 4.3 inch; Color: Black Product Weight: 50 oz; Packing List: 1* U Lock; 5* Keys;