For comparison: on the hp 214b they are 9/16". On the hp 3245a they are 14mm.
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For those jobs i have a Knipex 5" Mini Pliers Wrench 86 03 125. I prefer them because they grip the nut with parallel fingers and do not overturn. I have them in all sizes except the smallest. Just tracked them with keepa.com and other local price trackers and got them when the price was right. In the meantime there are other manufactureres, too. Just take care for the parallel grip and don't buy cheap rubbish.
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I use them to bend metal sheets or as a mobil vice, too.
