Review on Heavy Duty Seatylock Mason U Lock - Patented Diamond Secure Anti Theft Bike Lock With Keys - Ultimate Protection For City, Electric, Mountain Bikes, And Scooters by Robert Chandrasekar

I thought my 11mm U-locks and cable was adequate defense against low-life. Think again after watching U-Tube videos.Lock is lite and has a holder --bought separately :(. Great as lower-rear-wheel-lock to frame (a 3rd lock). If used this way it make's it difficult for bad guys to cut w/grinder w/o cutting bike. Not long enough to protect front-fork on 29er or to secure bike to post. Need another (longer) to secure bike to something. I read some thieves use battery-operated-grinders in some areas. This device will not stop them but anything else. Check w/police.