What hole saw is best for tapping ductile iron?

We carry three models of cutters that can tap ductile iron.

The H model, fine carbide tipped, can perform about 3-5 taps on D.I. pipe.

The Tiger model, heavy carbide tipped, can perform taps into all types of steel pipes with about a dozen taps on ductile.

The D.I. model is dedicated only for ductile iron taps and can perform up to a couple dozen taps through ductile iron pipe.

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