Mtsooning 10PCS High Speed Steel Twist, 1.4mm Cobalt Drill Bit with Straight Shank Electrical Drilling Tool, Used for Wood Cast Iron Aluminum Alloy Plastic Fiberglass DIY Craft

I had a difficult time 1/16" drilling brass sheet. I had to go through 3 bits to make it the 1/16". It is possible that I was not using the proper lubrication or feed rate. But other drills I have used similar technique with seems to work fine.I then went to use a dull bit as a graver tool. I ground the shank to the right angle, put it in a pin vise, and again tried to engrave some soft brass sheet. No go. Looking at the edge under a microscope should the cutting edge curled back.I hope I just got a bad batch, but I would not recommend these for anything other than drilling a single hole using up all ten bits.

These bits appear to have no cutting edge. I tried every single bit. Tried to use them through soft metal (pewter) in a pin vise, couldn't make a dent even with extreme force. Cheap bits from the craft store were better than these.

Can I give these ZERO stars? They are complete trash. The cutting edges have not been properly sharpened and will not cut even soft aluminum. All bits are the same. Take a look at the photos of two bits; notice the "flap" of metal rolled right off the tip. These bits have not been used even once and are straight from the package! This results in no bite and the bit edge just rolls over on itself. Don't throw your money away on this junk.

I usually break the small drill bits, easy to do. They also are easy to lose in a tool pouch for drill bits. A little plastic container for them is handy & easy to find when you have many size drill bits laying loose in a tool pouch.

Million dollar question, is it really 1.3 mm? I needed to drill an orifice hole in pipe for a burner. Propane ignites in a very narrow air/fuel ratio. I drilled the hole and the bbq burner ignited. Highly recommended!

measures 0.35mm on my calipers. works ok. keeping it safe with lower rpm. but I need a 0.5mm hole and they're not sharp enough to 'wiggle' and create 0.5mm.

great for drilling PCBs with a drill press.

Hard to find drill bits to drill seeds for rosariesJust right sizeNice qualityEasy to reshape too

Not sharpened, widely spaced thread. Bad for even soft plastic. Took ages for each hole and eventually gave up. Waste of money. I presume the 5* reviews are spam

I use small drills for making printed circuit boards for electronics projects. I have become used to having to replace bits very often as they become dull. However, these bits last way longer than the ones I have been using. Very please to have found them.

Bought those drill bits based on the reviews given. Unfortunately they didn't work for me. They are not made for drilling metal or stainless steel , not tough and sharp enough. Ok for soft materials such as plastic or softwood timber.

Great for the price. Cut metal very well.

good quality

Excellent product

Quality

Great just what I needed

Used for modeling. Nicely boxed

so far so goodhave used drills several times and haven't let me down at all

The drill bits are not as strong as I thought. Only tried to drill thin plastic and they snapped..

Very good quality used in model making.

I just got these, so I haven't used them very much yet, but am impressed so far.It's nice to have a selection of sizes, and I seem to like the 0.8 mm size.I was able to use one of these drill bits in my rotary tool (e.g. dremel) with an appropriately sized collet. I drilled some holes in a piece of copper sheet metal (20 gauge). The drill bit held up well and didn't break!

Price and delivery were excellent. Sharpening is poor and the bits cut slowly

Très pratique après avoir dessouder composent électronique pour déboucher trou du composant électronique.MERCI!