OnGuard RockSolid U-Lock – Angle Grinder Resistant 14mm Hardened Steel Bike Lock with X4P Quad Locking Mechanism, Lightweight Anti-Theft Design, Includes 5 Keys & Theft Protection, 3.5” x 6.9”

The Length is long enough for most places I would lock a bike up to. The lock is very secure. The lock is very Durable. It is well worth the money.

Very solid lock. I watched a YouTube review of these u-locks and this one took multiple grinding discs and still did not cut all the way through in 5 minutes. No luck is foolproof. But I think this one is very good and will slow a thief down. I use multiple locks on my e-bike so that they'll go to a softer Target. Highly recommend this product.. and you get five spare keys why you would need five I have no idea but it was nice.

A good lock but had to do a return as the dimensions weren't correct and didn't fit the chain I had bought with it

I have only used a few times, it is not the largest, but for its security rating and weight, and ease of opening and closing, it seems great. I am coming from a mini kryptonite ulock. It is much larger than that. The key seems thin and easily bent. So take care. However, they send a total of 5 keys, so should be good to go

My son has had two bikes stolen over the last 5 years. Not regular bikes either....fat tire bikes, so expensive. We looked all over to find the most durable lock available. This was the only bike lock available that was worth its weight....and believe me it's not lightweight. But the ease of use of this product was just what he needed and someone tried several times to cut through it to steal his bike while he was at the gym and couldn't. The cost was higher than other locks out there but when you think about it it saved him money from having to buy other bikes. Anytime he bikes anywhere those locks go with him and he has the piece of mind that his bike will still be there when he comes out. It's sad that they don't sell them anymore. I heard it was because of how much each one weighs. Yes they were heavy but I would rather deal with that than a stolen bike so if you run across one of these locks snatch it up, you won't be sorry.

Feels secure, gives peace of mind.

Watched plenty of "tests" on these type of locks. This seemed to mostly come out on top which probably explains the price. Hopefully the weight alone will deter anyone from even trying to mess with it. Would probably be easier to cut my bike frame into. I can't imagine how one would get a replacement key like this - so having FIVE is great. If I loose that many, I deserve to loose my bike :)

Light weight, a little small. But the videos seem to back up the angle grinder claims

Very light worth it

très satisfait, surtout quand le vélo coute un peu plus.....merci

Excellent

Empaque en buen estado, pero llegó con una llave doblada. Sobre el producto. No sé siente tan robusto como uno esperaría para un candado de este rango de precio. El recubrimiento parece bastante delgado, no confiaría mucho en su resistencia contra amoladoras. Vendido por Atlas

Solid lock not too heavy and big enough to lock back wheel and frame to a bike rack on the street. Get tons of spare keys with it too and it’s about half the weight of a kryptonite ny lock I have.