SPEED TIGERMicrograin Carbide Square End Mill - 4 Flute - ISE5/16 4T (5 Pieces, 5/16") - 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.

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

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.

Speed Tiger bits are individually contained in rigid plastic cases and all 5 in a cardboard box then in either a paper shipping bag or cardboard box. I ordered both 1/4” and 1/8” bits together but they shipped a day separate due to possible shipping error.The bits are a great improvement over cobalt in drilling hardened steel and stainless and reasonably priced.

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.

The design is a good one, but the execution is superb. I got the pkg. of five ⅛ in bits. I immediately tested it on the door latch for my new front door dead bolt. The strike plate already there meets the highest safety standard, which is done by the use of certain steels, their thickness, and the means by which they're attached to the door frame.The problem turned out to be that it was slightly off and it got in the way of the bolt extending. I spent a half-hour hand filing that thing to get it to work. When the bits arrived, I decided to see if I could use my Dremel tool with this bit to even everything off. Wow! What a great purchase. After juxtaposing the hand filing with the use of the bit, separated by less than 24 hrs, I'll never forget I have it when it can be useful and I know I'm going to be glad I do. This is a piece that is overkill for us mere mortals. It's meant for CNC gods.

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