NEIKO 10218A Countersink Drill Bit Set for Wood and Metal, 1/4” Tri-Flat Shank, 5 Piece Countersink Bits, M2 High Speed Steel

I've been working with metal for the better part of 50 years. This NEIKO Bit Set is great I used them so I could use counter sink screws in 3/16" metal (NOT aluminum) Metal Diamond plate. Mighty sharp Like a hot knife through butter. I'm very happy with this purchase. We were putting this metal diamond plate down on the bed of a box truck. About 75 holes before we weld it in. 5 bits come in a little case. It took 2 days to get.......... Thanks for hooking me up Amazon.

Excellent quality, well priced

I purchased these to do some standard countersinking on aluminum parts I was making on the mill. they worked very well, left a nice smooth cut, and stayed sharp for the entire project. Not sure how they'd fare with steel (but I suspect pretty well) since I didnt use them on steel.

Straight Through Durable for WOOD!!!!!

Okay, sometimes when you buy things like this for me which was a one time project, you think if I am able to get this project done with them I would be happy, but very shocked at how strong they are and how well they lasted. I had a price of channel boxed in steel that needed a hole on each side and the only way I would be able to line them up is drill all the way through. There was even a part that was welded and these drilled through fairly easly, did not break or become dull. Super great price too.

I'm kinda shocked. I totally expected these to be a throwaway set. I grabbed them shortly after a move, categorically-unable to figure out which box had my USA Drill and DrillHog bits, and in need of something quick. Amazon same-day'd em. Fair enough. But... I'll be damned if I can break the things, or even DULL em. I mean, not that I've been actively TRYING to or anything sadistic like that, but... I build fine furniture. I've prolly put 500+ holes in Maple, Red Oak, Sapele, Ash, and gods only know how much birch ply, and they're STILL going strong. I've thrown out DeWalt sets in less time. They're short (but hey, they DO call em stubby), but that just means they don't ever have enough torque on em to snap. They're brad-point (so wood ONLY), but that's cool by me; I'm a woodworker. They're HEX SHANK (and yeah, against all common sense and likely the manufacturers' warnings, I use them - frequently - in my impact driver), which is unheard of, but again: I suspect the "stubby" part is why I keep sweeping up sawdust and not shrapnel. I epoxied one of those little rubber bit holders to one of my DeWalt impact drivers and just use it - along with these bits - exclusively for pilot holes, which, if I'm totally honest, they're better at delivering than literally everything else I have, outside my braces and bits (and sometimes, you just need a hole. NOW). My ONLY complaint (which I didn't even dock a half star for) is that the little rubber bit holder they COME IN sucks. they fall out of it if you look at it sternly. But regarding the bits themselves? The absolute best feedback I can offer is this: HEY NEIKO! If you ever release a 10- 18- or 24-pack of these in the full gamut of sizes? I'll buy them in a hot second. Likewise, if you ever want someone to TEST em for you in real work-environment settings, you call me, you hear? I'll be delighted to give you the best analysis and feedback you've ever received from an end-user.

Works fine for drilling in wood for attaching wood pieces together. You just have to be careful about pressure applied to bit for "walking" out of line. I don't know about steel products.

Good