Cobalt is great for repeated drilling of fiberglass. Lasts longer than other bits.

As always the quality of the product is excellent but I ordered two drills of the same size and neither was the right one. However one was mismarked by the manufacturer. The size difference was obvious to the eye. This was the first time in over 25 years that this has happened and the service you get from Aircraft Spruce is great.

ok

ok

Drills Great

The metal sheets are fine. The drills are fine. And the rivets are fine. All good, thank you.

Great quality, good price

Used 1 (..and ordered 10) on a PA-12 wing to remove rivets, and its still going. VERY SATISFIED!

These are very high quality drill bits at a great price. I am a machinist and buy bits from a lot of different sources, but much prefer these in the sizes Spruce has available.

I ordered two #30 Bits in case one went dull. I had to drill out 96 rivets in a Cessna. No problem and I never needed the second bit. I center punched each rivet and the bit never wandered and it grabbed perfectly.

Great drills at a great price (which is good because you go through a zillion of them while building!).

Love the drill bits. They are the best on the market. Just wish whoever packaged them could count. I ordered and paid for 10, but got 9. How can I prove that?

For standard drilling tasks these are fine, but I went through five of them driving out a line of aluminum pop rivets.

Advertised as long lasting. That may or may not be true. They aren’t nearly as sharpe as HSS. They are far more prone to wander than cheaper HSS. Probably fine in a drill press but not a good choice for drilling aluminum, especially rivet removal.

I love the quick service however, using the drill gage purchased in the order the #41 drill bits were actually #40.

havent used them yet

The #40 and #30 bits are not split point. And I received #30 bits that had a negative rake angle meaning that it just sat on the surface and would not 'bite' into and feed into the material