BOSCH CO2159B 1-Piece 1/2 In. x 6 In. Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum

This is a comprehensive range of sizes in a sturdy case - with the added benefits of being Bosch-built, of Cobalt steel, so they should stay sharper, longer. When drilling steel or harder materials, it is always worth getting the drilling speed right for the work - and using copious quantities of drilling lubricant (if necessary), to cool the drilling area. Thus especially applies when you have invested in a set like this.

Fast delivery. Excellent product.

After burning out my old bits trying to drill out a half dozen broken off bolt heads on a rusty car frame, I put this set right to work the day they arrived, using progressively larger sizes and they performed beautifully. It's not a complete set by any means, as I had to purchase a bit separately to pre-drill the holes for a metric tap. Overall I'm very happy to have picked up this set for basic heavy-duty drilling on DIY repairs. For my purposes it's a good combination of quality at a decent price.

fits holder super

Actually DOES go through steel

Good bits for the price.