200PCS Solder Seal Wire Connectors - Sopoby Waterproof Solder Butt Connectors Kit - Heat Shrink Insulated Automotive Electrical Wire Terminals

These work perfectly. I would definitely use a heat gun as recommended a heat gun works great but I used a propane torch as well and had to be careful to not melt them.

*EDIT 5/1/2020* So I'm positive these are the best things in the world. I've finally exhausted the majority of the 50 pack and just gladly ordered the 280 and can say that 20-25 for these things is a great deal for how effective these are. For super permanent or less space-starved fixes I still prefer to sit down and solder/wrap normally (like wiring a car stereo) but for just about anything else, even stuff you might come back to, these are a game-changer. You can hold more heat shrink onto the back of the wires since it takes way less heat through the wire to secure these than actual solder where the wire itself can get pretty hot, especially larger more conductive wires that might start closing the heat shrink down the wire prematurely while securing the joint.This actually saved my butt when my headlight wire got caught leaving work (I get off after dark). I had thrown a few in my backpack "just in case" and it actually came up. These are super convenient and get the job done. They're actually pretty solid, too, and feel relatively trustworthy.I like these better than the hard, plastic crimps that don't shrink down, obv, but I mean these things are definitely more solid, and I feel like I've gotten those things tight. For anything worth anything that needs to be permanent, you want to splice, solder, and heat shrink. But when that isn't an option anytime soon, these are by far the most clutch tool to have in your electrical toolbox.

Great value and easy to use. its a must if u work on your car..

I like these connectors so far. It takes just the right type of procedure to get them to work. What I have done is to strip (proper size wire) the wires about 1/12 inch and insert the wires from both ends until the wires touch the insulation on each other leaving them bare wires exactly in the middle. Twisting for me did 2 things I didn't like. In most instances, it made making close connections very hard to do, and the other thing is that twisting the wires also most time made the wires bundled that way a bit too large to safely and easily pull the connector over them. letting the wires either naturally slide past each other or into each other made for the best results. The next thing that is required is to get a good quality heat gun and hold it about1.5 to 2 inches ways and heat while moving it back and forth. Heat from at least 2 different angles and the solder will melt properly, the sealer will spread out and the casing will shrink properly and provide a hold that is very difficult to pull apart. I used probably close to 50 lbs. of force and could not pull wires apart. Let the connections cool a bit before moving them around. If you have more force than 50lbs on your wires you need to do something to relieve that stress. These are not for every type of connection or for every place a connection is needed, but given the proper space and type of wire, these work far more effectively than I expected them to.

Great product worked well and sealed tight keeps out road salt from light wires makes a very flexible connection getting ready to order more

This set of solder wire seals is a great value, waterproof, super easy to use and very convenient to have.

These work pretty well but occasionally the outside will burn before the solder ring melts. This is the case with a torch, lighter, or heat gun.

this will make your automotive wiring projects much better, and easier.

I've always shied away from using but connectors and other crimp on style connectors except for temporary usage. I have always soldered and shrink tubed my connections and have never had an issue. I heard so much hype about these connecters that I finally gave them a try. To my surprise, they are just as good as soldering and shrink tubing the connections but with fewer steps. A real time saver and a good solid connection protected from the elements.

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Good product but grossly overpriced

Aun con pistola de calor al maximo la soldadura no se derritió. Solo el plastico se encogió, nada mas.

I do a lot of soldering and connecting wires and these are my favourite. So easy, this kit is cheap and has everything you need for a while and everything I have used these for so far has worked as expected. No complaints.