Spiral Grooved Step Drill Bit Set, High Speed Steel Titanium Coated, 4mm to 12/20/32 mm (5/32" to 5/4") Hex Shank Metric, HSS Cut Tool Set for DIY Plastic Wood Metal Aluminum Copper

Really good. Saved me loads of time. Very good.

Good quality for the price

The three bits arrived on time and were packed in a useful, if somewhat snug, wallet. Product appeared as advertised, although I question whether they are indeed coated in titanium as the ‘yellow metal’ coating was rather dull and lifeless and looked more like brass. To be fair this may have been due to a smear of grease.What I liked about these bits was the good quality labelling in the spiral groove of the diameter in mm of each step, which made it easier to identify how deep to drillIn use the bits I used cut easily in plastic, without any tendency to wander or distort the hole. However, the hole did need to be cleaned up, spirals of plastic sliced off with a sharp knife and then the piece lightly sandedOn balance, I would recommend these bits and order them again myself

Drilled straight through my steel shipping container for some cables. After trashing a couple of so called metal drill bits, ordered these and they went through easily. Nice you can drill and then stop exactly when the hole size is correct or test and drill a bit more if the hole isn’t wide enough.

Not sharp enough to start a cut on their own reliably (drilling through 2-3mm steel) I'll get to approx 1/3 on any of the bits and the bit stops cutting and simple heads up and warps what I'm cutting into. I'm going to invest in some decent bits as I can't afford any mishaps. Also after about 1 week of use I tried to drill some plastic bodywork and it's now so dull it melts the plastic instead of cutting it.Ok for a few DIY jobs, not recommended for professional use.

Do exactly what they're supposed to

Absolute rubbish. Snapped immediately

Does the job