Be sure to follow the recommendations of other reviewers: take your time, use a slow drill speed, and don't let the bit get too hot.

and it cut very well using medium speed

Low speed and with lubricant , it burnt up two steps from the 1.25 hole that I needed

I used a very slow speed and water to lub and this step bit worked perfectly.

Even with constant cutting oil coverage and slow cutting speed.

Keep the speed SLOW, especially when your doing larger holes

TITANIUM | HIGH SPEED STEEL: classic high speed steel with titanium coating for proven capability and durability in drilling holes in plastic, aluminum, copper, stainless steel and many other types of sheet metal

I'm using cutting fluid and a slow speed

Heat dulls the bit real quick so low speed letting the

I used a very slow speed and water to lub and this step bit worked perfectly.

My advice is:Use a slow speed drill with high torque much my issue was caused by using a high speed drill when I started the hole

Drilled at slow speed with a little cutting oil and it worked great