REVIEW titanium nitride coated alloy steel sae metric tap die set 45 pc pittsburgh harbor freightLarge 45 piece metric tap & die nc nf tool set kit includes heavy-duty tap & die holder handles. Made of heavy-duty alloy tungsten steel. This item is in the category Home & Garden\Tools & Workshop Equipment\Hand Tools\Taps & Dies. Listing and template services provided by inkFrog.