Strong Alloy Steel Construction: Made from high-quality alloy steel for exceptional durability and security. 4-Digit Numeric Code Setup: Easy-to-use code system for setting a unique password, no keys needed. PVC Plastic Sleeve for Protection: Wrapped in PVC plastic to prevent corrosion and scratches, ensuring a comfortable grip. Password Retrieval with Backup Key: Includes a backup key for easy password retrieval if forgotten. Included Mounting Bracket: Comes with a mount for easy installation on your bike or scooter, ensuring convenient carrying. Specifications: Shackle Thickness: 14 mm Weight: 1.96 lbs Size (Internal): 5.24 x 1.14 x 10.24 inches