BOSCH CO2148 1-Piece 21/64 In. x 4-5/8 In. Cobalt Metal Drill Bit for Drilling Applications in Light-Gauge Metal, High-Carbon Steel, Aluminum and Ally Steel, Cast Iron, Stainless Steel, Titanium

Of course this size drill bit is very fragile so I have to buy them often. These are good quality and stay sharp for a good amount of time.

It's BOSCH, as always it is high quality

German quality name,where made who knows but they work great..

Great replacement bit good value

First use, very sharp and bored the hole quickly.But the curious thing is they don't have any indications of the drill sizes on the case, so you are left with using calipers, a drill guide, or taking a guess what the diameter is of the individual bits. Even cheaply made sets indicate what the size in the position is at the positions, but not this Bosch kit.

High quality bit used it on hardened steel also used it to oblong the hole into a slot sides cut really well would buy again

Worked will in mild steel. 2" angle it cut through easily with cutting fluid.Still sharp and always use a smaller pilot drill to make the job easier.Especially on this size drill bit. BTW this is a HIGH speed drill bit. Don't try to drill through mild steel with a low speed. You'll heat up and dull your drill bits.

After suffering with cheap Harbor Freight bits for years, I finally decided to get a good set. Found them on sale, so went for it. The first use was with a 7/64 bit to drill into a screw that had snapped off. Worked perfectly with a bit of oil. Very good bits. I might buy another set.

The brand speaks for itself! Very good and solid bits!

Good quality drill bit, used for holes to accept grease fittings.

Needed a cobalt bit to replace one I had broke in my set.Price was great.

I really like this bit. It did the job drilling into metal. Highly recommended.

buena calidad