amoolo Cobalt Drill Bit Set (1/16"-1/4",13 Pcs), M35 HSS Metal Drill Bits for Steel, Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood

Great value bit set. They are very sharp and have drilled through everything up to .25” steel so far. I would definitely buy them again.

Pretty durable. I Put these bits through the ringer already and they are still sharp. Easy drilling and a good price,hard to beat.

I found these drills to be outstanding in low carbon steel - easily out performing the brand purchased from my local “home improvement “ store. I am knowledgeable about cutting tool design - and given my high level of satisfaction I thought I should offer some details to support my 5 star review. 1 first use : the drills were stable in cut and made accurate sized holes and required minimum feed force 2. Close review: these drills have well manufactured tip grinds. I have found many drills have poor relief grinds ( behind cutting edge) or poor lip to lip run-out - both of which cause instability and poor chip morphology when in cut. Easily identified under magnification but can be simply observed with significant heat generated in cut to the workpiece. ( a properly made drill applied with correct feeds and speeds will impart more heat to the chips produced) The flutes are also polished. This allows the chips to easily flow out from behind the cutting edge. I highly recommend.

Work fine for me so far. I was dismayed to see on the cover a list of metals on which I should NOT use these drills, some of which look like very popular metals I may need to drill. Moreso since I lack the expertise needed to distinguish the "bad" types of steel from any other types of steel. Though, for the price, paying for any mistakes I may make will not be tragic

I have always run to Home Depot to pick up bits. But these are the sharpest most durable bits I have ever purchased. DeWalt and Milwaukee can't even compare.

Needed to drill about 25 holes in stainless structural trim. A little cutting oil, and worked exactly as I needed.

I do not know what that means in this regard -- -- they work for wood, plastic, and metals, not cast iron or stainless

very hard to take out the bits and worse to put back really a pain to put the bits back in place

This doesn't work as expected. Too high price

Excelente brocas para metal duro y diferentes tamaños para el uso de trabajo.

Work good for stainless steel shaft. Much cheaper then buying local

Coupe très bien resté surpris

These bits are really brittle, so you need to read the description carefully to make sure you have the right set-up. Don’t be an idiot like me and try drilling deeper holes in wood without a press.