Bike owners, protect your ride with this seriously tough Retrospec Lookout U-Lock! Made from 14mm hardened steel, this thing is virtually indestructible and gives you real peace of mind when you have to leave your bike anywhere. The hardened deadbolt lock has an anti-rotation design that's pick-resistant, so thieves can't easily tamper with it. You get a 4-foot long security cable that's cut-resistant too - use the U-shaped shackle to secure your frame and the flexible cable to lock up your wheels for double protection. The included mounting bracket lets you keep the lock attached to your bike while riding, so you always have it when you need it. The package includes everything: two rust-resistant stainless steel keys, the mounting bracket, and that 4-foot cable. With a 9x4 inch inside shackle dimension and that flexible cable, this lock works with almost any bicycle frame and wheels. Stop worrying about your bike getting stolen and start enjoying your rides knowing your investment is safe!