Hymnorq 5-Piece Drill Bit Set, 1/2" M35 Cobalt Steel, Dual Twist Flute, 135° Split Point, Bronze Finish, with Tough PP Transparent Case for Hard Metals Like Stainless Steel and Cast Iron

I cut a lot of metal and stumbled across these bits last year....they are the best I have found. I use them for pilot holes which is the toughest drilling and they last for a lot of holes. I resharpen them 6 times and they still work well. I recently bought this new set because I have worn out the others...without any complaints.

These bits chewed right through hardened steel wheel studs like butter. I was getting 6" long continuous spirals of hardened steel.

Did OK in harden steel. Better value than the box stores.

I have 116 Solid Oak cabinet & drawers 3/4 inch thick to put pulls & handles on for a total of 166 holes I needed to drill. I bought a pack of 10 - 3/16 bits and hoped I'd be able to drill all of holes with them. The first bit chomped perfect holes thru very hard 3/4 in oak. I finished all in the kitchen & the bit was still drilling great, I kept going from room to room & floor to floor wondering when Id need to change the bit. I did the entire 166 holes thru 3/4 solid oak on the same bit and its was still cutting very good. Thats 124.5 inches or 10 feet 4.5 inches of solid oak. Wow!. Ill never waste money on a cheap set of drills again. These are available in 10 packs for any size & I'll never have to worry about running down or out of frequently used small bits again. I had a template set up so I drilled hard heavy & fast thru hard oak which heated up the bit and kept it working. This is about as hard as you can get for bits & at this price its more than a bargain. I was afraid buying some unknown far away brand but reviews were great and these drills did not disappoint one bit, pun intended, Customer for life, setting up a new woodworking & metal shop after my move from California to Wyoming and these are going to be my goto drill bits, highly recommended!

I was at work one day and pulled these out of my bag knowing I would need more than 1 to drill 60 holes in 1/4 inch thick steel. I was right. I needed 2 because the first one broke after 16 holes as it had been used several times previously. I watched a guy burn up 4 milwaukee impact bits on 20 holes. These bits are tough and stay sharp for a long time. I have ordered these bits twice now and will be coming back for more when I need them.

Purchased the 1/4" M35 Cobalt 10 pack based on ratings & price. I am a service tech and use them to drill either reinforced concrete walls or steel to mount fire extinguishers. They came sooner than expected in a nice plastic case. I used them that day to mount cabinets on warehouse walls. They worked very well. I had been using Red Helix that cost 5x as much. These work just as well or better. I will buy these again. I contacted Hymnorq - they have fast SUPERIOR customer service.

Just used these for the first time today. Drilled 16 holes into a wide flange steel beam, probably 3/8 inch thick. I was expecting to have to use the 2 or 3 bits to get the job done. Not the case! Was drilling through just as easily on the last hole as the first. I didn’t use water or oil or anything that smart people do. Work great. Accidentally ordered 2 packs of them but I’ll keep em around for future use! Impressed.

I had a big job drilling hundreds of holes through Stainless Steel. Blogs said both Titanium and Cobalt would work. I was burning through Titanium coated bits at a rate of approx every 4-5 holes, drilling slowly and using oil. I finally bought ten of these bits hoping they might be slightly better. I finished my 500 holes w about 2 bits. They also drill through Stainless about 10x faster. You can't go wrong w these. Don't listen to anyone if they tell you Titanium will work in Stainless.