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These are an amazing find, especially for the price! Plus they have smaller alligator clips than the ones I bought at Frye's, so they can fit better when using in tight spaces, and you get TWO of each color. If you troubleshoot a lot of components that are in-circuit, then you can really appreciate these, because the protective sleeves over the alligator clips are good and rubbery with great grip. You can slide them over the alligator clips and know that they will hold on tight and not short out another component. (The ones I bought at Frye's had very stiff plastic-like sleeves that simply would not stay in place.) Also I am totally old-school, so I lay out my test circuits on a piece of styrofoam and plunge the components in, then use these jumpers to connect the circuit and figure out a good layout before etching out a circuit board. I own two sets of these, have gotten a lot of use out of them, and found them to be highly dependable. Again and again, I have found All Electronics to carry products that are superior to and cheaper than the ones offered by big corporate chain stores.
Not bad for the price. OK for hobby work. NOT recommended for a school or engineering lab. I will not use these above 100V. Count the clip leads in the package. One of mine is missing and I don't think I lost it in 2 days. Test each clip lead. Ohmmeter check might not find loose wires. Use a automotive light bulb load to test at 2A.
These jumpers have worked really well while testing prototypes. My only complaint is that the clamps aren't quite strong enough to always hold two wires in one clamp. Overall though, good quality, good price.