MASTER LOCK Police Approved Bike Lock and E-Scooter Lock, Hardened Laminated Steel, 4 Keys, 4 Keys, 360 x 76 x 27 mm, for e bike scooter quad, Black

This looks and works like a big set of handcuffs, the centre link rotates to adapt to all angles, and will go round any kind of post or frame tube up to 3" (75mm) diameter. One Cuff round your frame etc, the other on something sturdy like some railings, a bike rack or a signpost. The good part is they will fold in half to make them a small secure system of locking your prized posession.The construction is strong and has a barrel lock thats harder to pick on both cuffs. But be aware that when you unlock a cuff, the centre of the lock pops out about 5-6mm and needs to be pressed back in when the cuff is closed for it to be locked (you dont close the cuffs and they auto lock like normal hand cuffs for people). Its easy to forget this the first time you use it and leave your bike unlocked.This aside for a quick stop the cuffs have a rubberised coating so they don't scratch your bike frame, so you can easily go frame to the place you lock to. But if you like me have QR wheels, then the best solution I have found for a longer stop is to go from the back wheel through the rear triangle formed by the seat stay and chain stay so your back wheel cant get nicked. Then use a cable to secure the front wheel, I chose an Onguard Akita Extender Cable 120 cm X 10 mm which allows the cable to pass through its own eye, and secure the front wheel. By feeding through the frame and onto the street cuff you can lock your bike to larger items that the street cuffs can't go on like trees or small children.To sum up its a sturdy piece of kit, and a great way of locking for a quick stop. However If you've got QR wheels/seat then you will need to get extra precautions like a cable to fully secure your bike for a longer stay.Its worth noting there is a specific bracket to hold this that attaches on your water bottle cage mounts Master Lock Street Cuff Bracket but it is a little pricey for what it is.

Perfect and very secure. A bit heavy for my liking.

Great product. These are quite heavy and struggling to find a bracket for them so made my own. Impressive cuffs and I wouldn't even attempt to try and break them (if I was a bike thieve)

Looks a well-made bit of kit. But the keys were missing.

I had meant to buy the version with the longer chain so I was initially disappointed. As it turned out though, I'm very happy with the single link version. The articulation brilliantly and lets me keep one end permanently attached to my bike so that I just hook the other end around the pole to lock it. There's no doubt that it's limited by being short and only being able to attach to objects up to the diameter of the cuff but it works nicely in the bike parks around where I live.

Locked my mrs to the bed frame. Worked a treat recommend to all looking for a way to make their evening a bit quirky.

Extremely good strong lock for my scooter

The cuff lock itself is feels highly durable and seems to weigh the same as a standard U-lock but it does take up less room in a bag.The keys, though, feel quite flimsy and I always feel a bit apprehensive that they may break in the lock while opening.My main frustration is that they wont fit round lamp posts which makes it quite difficult to use at my local super markets. I guess if the diameter was any bigger it would defeat the purpose of preventing would be thieves from levering it open. It just means I always have to find standard bike stands to attach it to.