Keeper 12 STD 12mm Hardened Steel Shackle Durable Construction: 12mm hardened steel shackle resists hand tools for superior protection. Enhanced Security: Reinforced collar over the keyway for added defense. High-Security Design: Features a high-security disc cylinder for reliable theft prevention. Convenient Transport: Includes a click-style transportation bracket for easy carrying. User-Friendly: Bent Foot™ design ensures effortless locking and unlocking. Protective Covering: Vinyl coating protects against scratches and weather damage. Additional Benefits: Covered by our Key Safe Program and a lifetime warranty for peace of mind. Specifications: Dimensions: 4" x 8" (10.2cm x 20.3cm) Weight: 2.40 lbs (1.09 kgs) Security Rating: 4/10