BOSCH TI21A 21-Piece Assorted Set Titanium Nitride Coated Metal Drill Bits with Included Case with Three-Flat Shank for Applications in Heavy-Gauge Carbon Steels, Light Gauge Metal, Hardwood

Great little bits. Sharp and strong. Was able to drill out a broken screw after other bits failed quickly. I just wish it was available in a left hand turn.

These bits are just what the DR ordered. Work very well.

I needed new drill bits for my collection, and what I do when they get dull, I add them to the sharpening pile for my Drill Dr. However, it is nice to have quality drill bits/jobbers, but a few extra common sizes to have on hand. I used one of them, and the jobber seems to be holding up.

I got the 21 piece titanium nitrate coating bits in a plastic index.Overall I'm happy with the purchase but I would probably not buy this set again.The plastic index is actually pretty nice. The bits are held in by tension, not to tight and not too loose. The hinge and locking mechanism are solid enough that they should hold up. The one bad thing about the index is that the sizes are not colored differently from the rest of the plastic so under certain lighting conditions it can be hard to see, not a show stopper though.The bits themselves were machined fairly well. They sat flush in the chuck and didn't "wobble" due to bending. The cutting edges are well centered and came pretty sharp from the factory. These are split point bits (which is what the "no skate tip" means), so they will be a little more difficult to sharpen when the time comes but worth the trouble. After drilling about 9 holes in 1/16 inch aluminum flashing and the pine wood behind the flashing I noticed that the titanium nitrite coating was completely worn from the outside edges of the flutes and about half worn from the point. This was a little disappointing, I was expecting the coating to last much longer. Once the coating is worn off the cutting edge you end up with a regular high speed steel bit, but 9 holes is such a low number, I feel like the black oxide might have been a better choice given the price delta and life of the coating.The shank of the larger bits (down to 3/16) do have three ground down points so you get a better torque transfer without the bit slipping in the chuck which is a plus.Interestingly these bits are only rated for up to 1500 RPMs which is a little on the low side; if you have a midrange drill you can easily surpass.

Great value high quality

Loved it! Will definitely buy more. Used the heck out of it. But I bound it up and snapped it eventually. My fault totally.

Quality

As described