These reusable connectors make the job much easier and neater, and they seem to hold on quite well. These are great for removable connections as soldering does not need to occur. Great product make the job faster and easier and look good as well. Connect any combination of solid, stranded, and flexible copper wires faster and more reliably. Safe and reliable, easy to operate. With flame retardant insulation materials and stainless steel spring structure, makes the wire connection does not fall off.