Narwhal 5/8" Drill Bits for Metal (M35 Cobalt - 3 Pack) 6 Inch Length & 135 Degree Split Point for Drilling Into Metal, Hardened & Stainless Steel, Cast Iron, & More!

Bought these for a job and I will be buying more! Cuts down on the time I spend drilling with other drill bits. Good quality. Stays sharp when using cutting oil but they will get ate up if you use them hard. Nice storage case and function as designed.

Really impressed with these bits. I have used them on steel and stainless steel and they work great

Great drill bits, better than many famous brands, drilled 10 holes in 3/8 inch stainless steel in less than 10 minutes, clean, sharp and it does what it supposed to do with ease, definitely recommend and can't beat the price

So i thought they were carbide bits but they were cobalt. Doesn't really matter they did a good job of drilling and they come in a nice package so the ones I didn't use aren't floating around my toolbox all willy nilly. Good quality if im in need of another handful of a different size I would consider buying this brand again.

Sharp and strong enough to hand-drill pilot holes for hanging eyescrews in 3D printed parts.

Excellent set of drill bits!! I put up a new trailer floor boards and only had to use 2 of these. They drill and they last!!

Used these to drill through a Geissele gas block and cold hammer forged barrel to pin the gas block to the barrel. Worked perfectly. Still sharp afterwords. The pack should last me forever for intended purposes. Also order several other size bits like these, so all in all I'm happy. Other purposes will be drilling through 7075 aluminum and polymer. I'm sure they can handle either with ease. I use tap magic while drilling metals, so if you're a person that goes ham on your bits, I cannot speak for the durability.

Lost its edge fairly quickly drilling steel. Not as heavy duty as I would have expected. Used oil to lubricant and water to cool to extend life.