Master Lock Criterion Gold Sold Secure Octagonal Bike Lock Dimensions: 270 X 104mm / 16mm Hardened Steel Octagonal Shackle Provides Superior Resistance Against Bolt Cutters The Dual Locking Mechanism Gives Enhanced Pry And Pull Resistance High Security Disc Cylinder With An Anti Drill Plate For Protection Against Picking & Drilling Anti Dust Key Way Shutter To Protect The Mechanism From Dust, Dirt, Etc