Don't buy it. They are round with 2 flat points for wrench or open ended installation. You can't use an Allen key, socket wrench or wrench, so you can't tighten them enough. (Always replace the nozzle with a hot end before printing at 200-220C if you are new to 3D printing.) You can find other kits that are hexagonal and come with a cool tool. I threw them away after they broke the filaments in my hot end and had to replace them on a 3 week old printer.
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