SPEED TIGERMicrograin Carbide Square End Mill - 4 Flute - ISE1/4 4T (5 Pieces, 1/4") - for Milling Alloy Steels, Hardened Steel, Metal & More – Mill Bits Sets for DIYers & Professionals

Bought these for a hobby. Received them and like that they are packaged individually, thus helping keep them sharp. Used them on a firearm building project and only eneded up using one. But stayed sharp and met the needs of what I was using it for. If your are a hobbyist and looking for some high quality milling bits with out having to pay a premium these are the ones to go to.

Have had great success on drilling 1/4" AR500 steel with this in a drill press. Had 1 snap due to my handling, but the 2nd bit has already lasted 140+ holes in AR500.Of course used oil on each hole.

Great endmills and a great price. I use them on hardened tool steel and had no issues.

End mills usually have a flat spot where the end mill holder's set screw locks in place to avoid spin. This does not. The holder's set screw seems to hold it adequately for my needs but it was a surprise considering my previously wonderful experiences with Speed Tiger.Update: It cuts rapidly not just through carbon fiber but also through acetal as fast as my mill can advance it.

I’m pretty sure that I;m never buying another end mill that ISN’T a Speed Tiger. I’d broken my only two carbide mills trying to alter a badly machined Arbor, so I grabbed a 5 pk of Speed tiger, in the size I needed, thinking I’ll probably break them all trying to mill this hardened tool steel. …i put the first Speed Tiger in my mill, and off we went. This thing was begging for me to feed it faster, i finished the job in two passes through the crunchiest hard steel i’ve ever milled…this stuff sounded like milling glass. ….the Speed Tiger breezed through it like i was cutting half melted aluminum, and was still as sharp as it was when I cut myself on it, mounting it, the first time.I was really shocked that it was UNphased by the crunchy hard steel that broke my other bits. …i’ll never need the other 4 that I bought… I guess they just put the other 4 in the pack, for emotional support. 😳I really hope that I can afford some larger sizes.

I have been using end mills for 30 years now. These are very good end mills for the money. They are not Hurricane, but you didn't pay Hurricane prices either. These are sharp, and hold their edges well. However, you need to know that this is also a specialty item. You are buying solid carbide because the job you are doing requires an end mill harder than the work piece. And at 1/8 inch, solid carbide, even the slightest wiggle will shatter it. You cannot have RC65 and over without being brittle. The picture, trying to end mill a hole to remove a broken bit that was about as hard as the end mill. First end mill grabbed and shattered. Went in again, second end mill finished the job.

All endmills are excellent quality and delivered before they were due.

Nice cutters. They're doing a fine job. A good value.