6 Pcs Countersink Drill Bit Set with Case 1/4'' Hex Shank HCS 5 Flute Countersink 90 Degree Center Punch Tool Sets for Wood, Quick Change Bit 1/4” 5/16" 3/8” 1/2” 5/8” 3/4”

This is great kit with useful sizes and handy box-organizer.Bits that I used so far, are working grate on aluminum and steel objects.

These work nice , its cool that it fits my drill, and comes in a cute box

The main issue with why these are only 4 stars is the bits are a little less than perfect. For metals they leave a rough edge (hangers of metal) that leaves much to be desired for a better quality bit. For wood or other softer materials they work well enough but were difficult to get a bite (begin the drill hole) so I'd recommend a tap with a hammer and nail first to get the thing to bite more easily. For metals this just isn't a possibility but you should be using a drill press anyway if you're trying to countersink stainless or workable metals. Also, don't forget to use proper lubrication when drilling metals.

Boxed in a handy set with foam dived bit holders these countersinks bored out screw head insets in hardwood with ease. I can't say about longevity or durability, but these are a great addition to my tool set and hopefully will last. I would purchase again!

The only caveat is to be sure and let the tool do the work. These are sharp and move through the wood quickly. Neat and clean divots.

The cutting was great. I used to counter sink holes in board's for my pontoon trailer. Great quality would highly recommend .

As described

I used this kit for a couple runs of some 3/16 aluminum strips that needed countersunk screw holes. Of course I used some CRC cutting fluid and my drill press and this worked its way down the line for about thirty holes. All seem to look great and the screws fit in perfectly. I'm very satisfied with these. You could easily use these with any drill or impact driver.