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OnGuard's Boxer X4 Disc Lock #8046 features a large, 55mm x 55mm (2.17" x 2.17") opening that fits large disc and rotor openings. - Massive 16.8mm (0.66") hardened steel shackle resists all attack from cutting, prying or jacking - X4P Quattro Bolt locking system secures the shackle on four sides for ultimage protection - Included disc reminder helps prevent accidental drive-offs - Security Rating: 97/100

OnGuard's Boxer X4 Disc Lock #8046 features a large, 55mm x 55mm (2.17" x 2.17") opening that fits large disc and rotor openings. - Massive 14mm (0.55") hardened steel shackle resists all attack from cutting, prying or jacking - X4P Quattro Bolt locking system secures the shackle on four sides for ultimage protection - Included disc reminder helps prevent accidental drive-offs - Security Rating: 80/100

OnGuard's Boxer Disc Lock #8052 is a stapler-style disc lock featuring their Touch Lock System for convenient one-hand operation. - Pick, pull, and drill resistant Z-Cylinder locking mechanism - Larger, 10mm (0.39") hardened steel pin secures lock to disc - Includes disc reminder cable and carrying pouch - Security Rating: 60/100

OnGuard's Boxer Disc Lock #8054 is a stapler-style disc lock featuring their Touch Lock System for convenient one-hand operation. - Pick, pull, and drill resistant M-Cylinder locking mechanism - Larger, 8mm (0.32") hardened steel pin secures lock to disc - Includes disc reminder cable and carrying pouch - Security Rating: 60/100

OnGuard's Boxer Disc Lock #8051 is a stapler-style disc lock featuring their Touch Lock System for convenient one-hand operation. - Pick, pull, and drill resistant Z-Cylinder locking mechanism - 5.5mm (0.22") hardened steel pin secures lock to disc - Includes disc reminder cable and carrying pouch - Security Rating: 50/100

The Boxer Disc Lock #8107 is an elegant stapler-style disc lock featuring their Touch Lock System for convenient one-hand operation. - Pick, pull, and drill resistant Z-Cylinder locking mechanism - 5.5mm (0.22") hardened steel pin secures lock to disc - Flip-open keyway cover keeps lock internals clean and operating smoothly - Additional opening provides convenient place for another cable or lock - Security Rating: 46/100

This bracket is designed to either mount to your seatpost or top tube. The bracket is designed to hold your lock while you are riding.