sisona 1/8 3/16 1/4 5/16 3/8 Carbide End Mills Set - Solid Carbide (Tungsten Carbide + Cobalt) - 5Pcs 4 Fulte CNC Mill Bits for Steel - TISIN Coated

These bits are very sharp and durable.There is no visible wear and tear after long time of work.I am happy with it.

These are not the top of the line, but you do get what you pay for, they will do the job, but the longevity of the bits is not that of the higher quality bits

These are perfect for home use, hobbyist. My husband is in the manufacturing engineer world and deals with machine tools day in and day out. While they are not the caliber for high-end CNC machining, he was impressed with them for home use. If he has an update I will be sure to post it.

These Sisona bits do cut through thick solid steel pipe and thick ceramic AFTER using a different kind of drill bit to start the hole. You CANNOT use a center punch or anything on ceramic though. And a center punch isnt going to go far in the solid steel pipe I tried to drill through. HERE’S WHAT HAPPENED IN THE STEEL PIPE I got two sets of Stubby Drill Bits for Thick Steel at the same time. The largest NordWolf Bit wasn’t big enough, but it did easily stay centered on a Very Thick, Very Heavy Steel Pipe, and drilled through the first side like hardwood. Then I was going to try the same size bit in this set on the other side and it absolutely would NOT stay, no matter what I did. No matter how strongly I held it or careful I was, it kept walking and wandering off to the side. I tried a lot of times, and it would Not even START to drill a hole. I really wish I could have actually got a hole drilled with one of these bits, because the NordWolf only stayed sharp for the one side. It went completely dull on the very next side. Didn’t even drill two holes. HERES WHAT HAPPENED IN THE BOTTOM OF THE LARGE CERAMIC POTS Two large Ceramic Pots outside needed holes in the bottom before it rained. Again, the NordWolf drill bit was too dull after one use to even start the hole, so I used the next size down. And again, these bits absolutely wandered and walked away constantly, even from the starter holes I made!! I finally finished, but my cordless drill worked harder than ever before. I hope its OK.

I wont know how durable these are until Ive worn one out. But I make some test cuts with them in a small mini mill (the common seig X2 that is sold by Micro Mark, Grizzly, and many others) on mild steel plate. They had no trouble making smooth clean slot cuts .030 deep x 5/16 wide in a single pass. They definitely cut with the sharpness and smoothness of carbide. Then I tried some facing, edge, and plunge cuts in the same mild steel, and got good clean results. It throws neat, uniform chips with no burning or chattering. How long will they last? Who can say. But they do a nice job as new.