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I was somewhat skeptical of this product, but it exceeded my wildest expectations. The connections are tight, well sealed and low profile. They also retain flexibility that approaches the original wire. Soldered and heatshrinked connections are bulky and stiff - and arguably inferior to a good crimped connection. These combine the mechanical bite of a crimp with the low resistivity of a soldered connection. I used these when making harness connections in my Subaru swapped Vanagon and have been very pleased. They do not appear to have glue in the heat shrink, or at if they do it is very light. I would prefer that but the heat shrink seals well and I have no concerns with the shrink in this application. I'll buy more when I run out.

I had never used these before so I was a little iffy when purchasing them. I tested them to join two pieces of wire and wow, very strong. Once I melted it with a heat gun I could NOT break the connection with my hands. I pulled very hard and it did not come apart at all. Ended up using various sizes of these to replace the wiring to my Jeep fan speed switch.

I used a bunch of these, mostly the blue size, on an automotive project. They worked great, but it is important to concentrate the heat on the solder and avoid putting too much heat onto the wires. To do that, I used the "funnel" attachment for my heat gun that you see in the picture. Without this, it was impossible to get the heat where I wanted it. My heat gun is very old (30+ years?). Maybe newer heat guns are better?

Didn’t even know these existed. If you want to make good quality, professional splices, this is the way to go! Once you heat these, the solder melts into the connection and the shrink tube seals around the insulation make a perfectly sealed connection.

These things are the greatest. Used them to wire all my LED lights on my motorcycle to the ignition switch and each other. Easy to install with a heat gun. No more soldering wire joints for me.

Used these to install my radio and speakers on my boat. They worked great. Was nice to have all the different sizes I needed on hand!

I really love using these, they make splicing wires together incredibly easy. I bought them ages ago for a project, and recently used them to splice some worn wires in my car's wiring harness. I ran out of the red ones, so I bought more. They're very useful!

This is a nice kit of splices. I have purchased another one after using the first kit.

Makes easier to connect wire and looks organized.Helps to hide open wire whick makes it safer

For me connecting small wires on my motorcycle has always been a hassle and these work great.