what is the recommended speed for this bit for stainless steel?

I use an ancient Craftsman 1/2 horse with one speed (400RPM) and can get through anything.

Will this bit drill cast iron pipe?

I have used the bit on stainless, carbon, galvanized, and aluminum. One recurring issue is as each step breaks through, it catches and hard stops the bit. That action might cause cast to crack, especially on the larger diameter holes.

ASIN	B0886JKJMD
Best Sellers Rank	#47,641 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Step Drill Bits #57 in Metalworking & Multi-purpose Drill Bits
Brand	STROTON
Brand Name	STROTON
Customer Reviews	4.6 out of 5 stars 1,104 Reviews
Cutting Angle String	135 Degrees
Cutting Diameter	32 Millimeters
Cutting angle string	135 Degrees
Cutting diameter	32 Millimeters
Finish Types	Brass
Finish type	Brass
Item Dimensions	14.8 x 7.2 x 4.1 centimeters
Manufacturer	STROTON
Material	Cobalt
Material Type	Cobalt
Minimum Bore Diameter	4 Millimeters
Model	Cobalt-15s-(4-32mm)
Number of Flutes	1
Point Style	Taper Point
Shank Type	Straight
Shank type	Straight
Surface Recommendation	Iron, Stainless Steel, Iron Plate, Aluminium, Wood, PVC, Plastic
Tool Flute Type	Spiral
UPC	630808641435
Unit Count	1.0 Count

4-32mm Metric 5% Cobalt Step Drill Bit for Stainless Steel and Hard Metal (15 Steps)

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