The Kryptonite Keeper 12 U-Lock is a great moderate security bike lock option.
http://www.kryptonitelock.com/content/kryt-us/en/products/product-information/current-key/997955.html
12mm hardened steel shackle resist hand tools
Reinforced collar over keyway for increased protection
High security disc-style cylinder
Includes click style transportation bracket
High security Bent Foot™ design for ease of use
Protective vinyl covering
Key Safe Program
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Kryptonite Keeper Standard 12mm U-Lock Bicycle Lock with FlexFrame-U Bracket
The Kryptonite Keeper Standard U-Lock features a 12 mm hardened steel shackle with a double deadbolt anti-rotation design that resists bolt cutters and twisting leverage attacks. The lock’s disc-style cylinder with center keyway is protected ... (as of November 28, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
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Kryptonite Keeper 12 Standard Heavy Duty Bicycle U-Lock with Bracket (4-Inch x 8-Inch)
12mm HARDENED STEEL SHACKLE resist hand tools. Reinforced collar over keyway for increased protection. HIGH SECURITY DISC-CYLINDER. Includes click style TRANSPORTATION BRACKET. High security BENT FOOT™ DESIGN for ease of use. Protective vinyl... (as of November 28, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
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Kryptonite Evolution Series-4 1016 Integrated Chain Bicycle Lock Bike Lock, 5.25'(160cm) chain length
10mm six-sided chain links made from 3T MANGANESE STEEL. Patent-pending END LINK DESIGN secures chain to hardened deadbolt eliminating critical vulnerability. HIGH SECURITY DISC-STYLE CYLINDER is pick and drill resistant. Patented, reinforced... (as of December 4, 2019 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
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