Well it just goes to show what you can learn these days. I always thought the pronunciation was WAGG-ohs, as in, "Let those waggos roll!" 🐎
The alternative brand linked by @Jen-in-Wellies looks good, and I learnt that the tiny window at the end is properly termed a Continuity Check Port. Wow, just amazing what value you can add on to your product with fancy wording. For me, seeing the ends of your bare conductor appearing in a transparent window always reminds me of the grubs of certain parasitic wasps, which lay their eggs in live caterpillars. As the grub grows it eats out the still-living caterpillar from inside, eventually appearing in a translucent window in the side of its host. Gruesome yet fascinating.