Nipple wrench would be any one that mentioned 'revolver' in the description or title (sizes are 'revolver' or 'pistol', 'Walker' and 'rifle'). If you can find one that's been hardened buy it regardless of the price. It'll be more, but it'll also be worth it. The slots in most wrenches are thin walled and wear out soon, so the extra cost of hardened steel will save money in the long run. Track of the Wolf used to carry hardened nipple wrenches but I've not seen them lately, so I don't have a good link to give you.
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