any recommendations for a step drill bit?

[Prajna]

Mine are from the China shop. I didn't expect them to be much cop but they've drilled a few holes, including 10mm in 10mm ms bar (cause I had no 10mm drill bit with me) and I have to say they have well exceeded my expectations.

 

[Moose McAlpine]

Ruko are decent.

Ruko are very good. I have a set of theirs.

I have some cheap ToolZone ones from Amazon, surprisingly good and haven't died from the abuse i've given them.

 

[Ruffian]

Usually use lidl or aldi, but

Even the esbacher one from screwfix isn't bad.

Abused them opening 10mm holes up to 16mm through 4mm stainless,

Would recommend a decent cutting paste also.