EFFICERE Best Choice 8-Piece 1/2” Shank Silver and Deming Drill Bit Set in Aluminum Carry Case, High Speed Steel (HSS) | SAE Size 9/16” - 1” by 1/16th Increment

These bits are very durable. They stay sharp a long time and are great for those odd big sizes. I had to drill out lower control arms for my RV. The new arms had a smaller diameter than the old ones, so after boring out 8 cast holes, the 9/16 but is still pretty sharp. Great value for an entire set.

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Buen producto👌 es la segunda vez que compró estás brocas y para el precio funcionan correctamente. Lo recomiendo⭐⭐⭐⭐⭐

I'm using them on my milling machine and for the price they are pretty good. I have used them heavily in the past few days on all sorts of metal and no issues. Anytime I drill or mill I use coolant. Best thing to do is shelf your WD-40 or cutting oil and just get and mix up some fusion cool 2240. Don't overspeed your bit, every metal has a specific cutting speed or milling or turning speed. I've read reviews saying bits get dull fast, etc. Trust me, it's the operator, not the bit. I've used fusion cool for 2 years now and never had to sharpen a single drill bit. I'm using that with these bits and I doubt they will get dull. Tolerances are good and they came in a case individually wrapped. Cuts through 3/4" steel with no problem and still remains sharp.

For the price there great