M35 5% Cobalt Metric Drill Bits Set (1mm-10mm/19pcs), Straight Shank Jobber Drill Bits, Metal HSS Twist Drill Bits for Stainless Steel Hard Metal and Cast Iron

This set is a great value for your money . The storage case is very functional and markings are easy to read. The 5% cobalt content makes them very durable and are very sharp. I have drill metals and plastics so great drill ability. Great buy if you are into 3D2A projects.

I went through 3 other bits to drill 5 holes in a steel utility trailer. Then ordered these drill bits. I drilled over 30 holes in same steel trailer frame using one ONE of these drill bits! Still remained sharp. Remember to use alittle oil when drilling. Seriously, these drill bits are great!!

Some claim these are not solid cobalt...maybe a coating...I did not really test these out but my intuitive hunch says maybe these are on the cheaper end ... if these don't end up lasting more than 1 use. ( but I don't really know ). Just wondering what the amazon procedure is to test actual claims. 5% this 8% that.

Bits work great. Mostly used these to drill holes in plastic parts, which is relatively easy. They are definitely sharp out the box and left very clean holes. My only complaint is the box. Mine came with the black holder in pieces. Not sure how it got broken inside of the clear plastic box. I'm not interested in replacing when all it does is store it, just a slight annoyance.

very nice product

solid drill bits.

Kept lubricated, cut through 1/4” thick steel post for 8 holes, all with only 1 bit

A lot of 3d printing files call for metric-sized holes, so I bought some metric-sized bits. They work great. Haven't really tried them on wood or metal, but plastic is isn't much of a challenge for any bit. Nothing bad to say though, and the drill index / box is pretty nice.

I made my mounting rack for my solar panels out of used steal pipe, and I had to drill quite a few holes for mounting these panels. The piping was quite hard and I bought five drill bits, so as to make sure I wouldn't run out. To my surprise the drill bits held up really well and I was able to drill all the holes with just one bit. I did pre-drill the holes with a center drill, but that was all I used, and of course some lubricant. I never thought that I could drill these many holes without wearing out the drill bit. Quite amazing.

A hardened piece of steel that broke several conventional bits did not stop these drills. Amazing difference from normal drill bits. Use caution; they will snap if driven too hard / fast. Use lubricant and go slow...they work very well.

Wanted,to have these bits, last longer

Buen producto.

Pense que iba a traer el estuche que tiene en la foto pero lo importante son la brocas y si cumplen con mis necesidades