CYLBAQ3pcs Spiral Step Drill Bit Set, Titanium Nitride Coating High-Speed Steel, 4mm to 12/20/32mm(5/32" to 5/4") Triangle Round Shank, HSS Cut Tool Set for DIY Plastic Wood Metal Aluminum Copper

This is a great step drill bit with 12 stages from 6 - 60mm, it seems well engineered from High speed steel and comes in a plastic box with an end cab over the tip of the drill bit to protect it.Most step drill bits don't go up this big so I was pleased to find one that did. We use it on steel and acrylic sheet and it performs well.The shank is 13mm dia / fits in a standard chuck. Not much else to say except I would buy another if I needed to.

Used this bit today for the first time and i am extremely disappointed. My job was to cut 2 35mm holes threw 3mm sheet steel. The first hole cut ok i kept cooling it with water. However the second hole i had problems trying to get the hole cut any bigger than 25mm. After about 20 minutes and going threw 2 fully charged battery's on my drill i gave up and decided to get my old holesaw bit from the van which flew threw the steel in just under a minute. I dont know if all these bits are like this or i just got a bad one but i wouldn't recommend them as mine was not fit for purpose. Money wasted to be honest.

Used this several times in 5mm mild steel. It's OK up to about 25 mm diameter. It would probably make larger diameter holes in thinner materials with ease.

everything is ok thanks

I needed the step drill to enlarge 2x 37mm holes in steel bath to 45mm in-situ - restricted space. Worked a treat but burnt out my old Bosch drill in the process. Most drills are rated to 13mm in steel! Take it slow and easy or buy a very expensive drill. I resorted to using a SDS/13mm chuck converter in my DeWalt 2kg drill - just because I had it.

You get what you pay for, I needed a large diameter hole in 2mm plate, it did that.Not sure how it would fare against thicker steel or even stainless. But it did what I needed it to do.Question is would it be able to do it twice?

Not worth the money

Some heavy kit ,a little on the big side for what I needed it for but very well made and will come in handy.