The Monster Lock Defender 4 Plus Combination U-Lock System delivers heavy-duty security with the convenience of a key-free design. Its 12mm hardened steel shackle resists cutting and prying, while the 4-digit resettable combination provides up to 10,000 possible codes for dependable theft protection without the hassle of carrying keys. A durable PVC rubber coating helps protect your bike's finish while shielding the lock from the elements. Designed to secure bicycles, e-bikes, scooters, and other valuables, the Defender 4 Plus offers confidence for commuting, campus, and everyday use.
Lock Type4-Digit Resettable Combination
Shackle12mm Hardened Steel
Security10,000 Possible Combinations
CoatingPVC Rubber Protection
Dimensions10" x 5.5" U
Ideal ForBikes, E-Bikes & Scooters
Heavy-Duty Hardened Steel
The 12mm hardened steel shackle is built to resist cutting, prying, and tampering, providing dependable protection for your bike and valuable equipment.
Resettable 4-Digit Combination
Create your own personalized security code from up to 10,000 possible combinations for convenient, key-free protection that's easy to use every day.
Protective PVC Rubber Coating
A durable PVC rubber coating helps prevent scratches and scuffs on your bike frame while protecting the lock from weather, moisture, and everyday wear.
Compact & Versatile Design
The 10-inch by 5.5-inch U-lock opening is sized to secure bicycles, e-bikes, scooters, and other gear to bike racks, poles, and fixed objects without unnecessary bulk.
Designed for Everyday Security
Whether you're commuting, riding to school, or stopping around town, the Defender 4 Plus offers strong theft protection with the simplicity of a combination lock.
Trust the Monster
Built for riders who demand dependable security, Monster Lock products combine rugged construction with practical features to help protect your gear wherever you ride.