5Pcs Countersink Drill Bit Set, Premium Countersink Drill Bit with 82-Degree, 5 Flutes, Quick-Change Hex Shank, 1/4 Inch to 3/4 Inch Size, Countersink Drill Bits for Wood, Metal, Plastic

I have used these countersinks on wood, low carbon steel, aluminum and acrylic. They are performing as good as tooling I have paid 5 times as much for. They are staying sharp, and cut without accumulating cuttings at the flute.

Nice set of counter sinks. Works as expected. Clean edges if you use them before you drill the pilot hole. No storage box because it was cracked and useless. But the holder keeps them organized and I keep them in a dedicated bin so a box isn't needed.

Great buy to replace the ones you already have had and worn down to the nub. Haven't had to use much, but so far, they dont feel built to last. Will update

Work extremely well, throw shavings out of hole while boring it, all 5 sizes cover any depth you'll need to make to hide a screw or bolt. But I got rid of the little rubber holder cause the 5/16's and 3/8s would also fall out from the rubber being stretched. So I love the way they work and ive used them quiet often with no complaints except if i hadn't noticed it i would have lost the 2 biggest ones which sre also ones I use very regularly..

Used them a few times for wood. Works well and I like the different sizes. Good value.