Kryptonite Keeper 712 Bike Chain Lock, 4 Feet Long Heavy Duty Anti-Theft Bicycle Chain Lock with Keys for Bike, Motorcycle, Scooter, Bicycle, Door, Gate, Fence,Black

Bought these for my brother to use for his electric bike when he goes to work, and so far so good. Heavy and sturdy and durable. Someone tried to cut it to steal his bike and the best they could do was a little mark in the outside cover. Couldn't get through the chain. So it has served it's purpose! Will continue to use.

I love it. The quality and the weight of it is absolutely perfect!! My ebike will arrive tomorrow and I am going to carry my lock with me in a bag on the back of the bike. It's not too heavy but excellent made. Thank you!

While kind of 'pricey' the thought of losing an item that's costly itself & a necessary form of transportation these days was a huge factor in selection of this security device.As the collapse of society seems more evident every day, the thought of some miscreant 'Coming-Up'... was another motivating factor in investing in a good locking device.This lock is a Beast. It is quite heavy, so those concerned about weight may want to reevaluate choices. In this case, weight wasn't so much an issue. Theft deturent WAS.Cable bike locks can easily be cut with simple cheap cable-cutters quickly. This lock? Not so much.Can it be cut? Yup. Quickly & quietly? Nope.Can it be picked? Yup. Quickly? Nope.Good thick high-test chain was only option. Not liking paint or frame damaged by intense rubbing and/or chain banging, a high-quality sheath was highly motivational in this selection.While the weight can be a drawback, another small issue is the lock cylinder can be a bit finicky at times. However this can be sort reassuring in of itself, by being rather difficult for a novice 'picker' lacking proper tools.Appearance was another deciding factor as it looks tough, rugged & matches bike styling. And... in a 'pinch'...it could make a hellva defensive weapon.'Peace-of-Mind'... Who can put a price on that?When a beloved 'high-value' item has to be left unattended, it's nice to see that it's..."Right where I left it".

great chain for the price.

excelente producto

Durable

Well, I haven’t had anyone tried to use a lock cutter or pick the lock as of yet but from the weight of it and just by observing it it seems like a very good luck, but obviously action speaks louder than what I’m looking at so I’m not sure

If you buy this, no1 is stealing anything you've got it connected to! It would definitely take some TOP of the line power tools for thieves