SPEED TIGER Micrograin Carbide Square End Mill - 4 Flute - ISE3/16 4T (5 Pieces, 3/16") - for Milling Alloy Steels, Hardened Steel, Metal & More – Mill Bits Sets for DIYers & Professionals

Very sharp and long lasting. I have used this brand for several years without any problems. Cost is appropriate for the quality.

Use these with my CNC mill and they do the job well.

Cut well. I ran it for 1.5 hours in 316SS the endmill did not wear out. I Still have the used endmill in my toolbox ready for the next job.I purchased a second one for "just in case" did not need the spare endmill but am happy to have it for future use.

For the money they work well , they hold up well

they are a bit brittle. If the cutting head moves (shudders) they will chip.

I keep buying these to replace my hss end mills. They are awesome, and cut like a hot knife through butter. I cut a lot of 416 stainless and these make hss look like junk. Almost no burrs to file off even after cutting a keyway in a threaded shaft. Definitely a must.

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.

Perfect

Used it to cut a 1/2" keyway into a shaft 7" long. worked with great satisfaction

Milling