![In case anyone doesn't know this(I certainly didn't), drill bits for glass work pretty well drilling through hardened steel. More info in comments. : r/Blacksmith In case anyone doesn't know this(I certainly didn't), drill bits for glass work pretty well drilling through hardened steel. More info in comments. : r/Blacksmith](https://i.redd.it/yf6um2g060r91.jpg)
In case anyone doesn't know this(I certainly didn't), drill bits for glass work pretty well drilling through hardened steel. More info in comments. : r/Blacksmith
![5/10pcs M42 Cobalt Drill Bit Set 0.5-10mm for Drilling on Hardened Steel, Cast Iron and Stainless Steel (Color : A, Size : 4.5mm 10pcs) : Amazon.de: DIY & Tools 5/10pcs M42 Cobalt Drill Bit Set 0.5-10mm for Drilling on Hardened Steel, Cast Iron and Stainless Steel (Color : A, Size : 4.5mm 10pcs) : Amazon.de: DIY & Tools](https://m.media-amazon.com/images/I/61fW42ixZOL.jpg)
5/10pcs M42 Cobalt Drill Bit Set 0.5-10mm for Drilling on Hardened Steel, Cast Iron and Stainless Steel (Color : A, Size : 4.5mm 10pcs) : Amazon.de: DIY & Tools
![HARFINGTON Twist Drill Bit 11.5mm Titanium Coated (HSS-E) M42 High Speed Steel 8% Cobalt Straight Shank for Stainless Steel Aluminum Alloy Metal - Amazon.com HARFINGTON Twist Drill Bit 11.5mm Titanium Coated (HSS-E) M42 High Speed Steel 8% Cobalt Straight Shank for Stainless Steel Aluminum Alloy Metal - Amazon.com](https://m.media-amazon.com/images/I/81b1-ZK7zLL._AC_UF894,1000_QL80_.jpg)
HARFINGTON Twist Drill Bit 11.5mm Titanium Coated (HSS-E) M42 High Speed Steel 8% Cobalt Straight Shank for Stainless Steel Aluminum Alloy Metal - Amazon.com
![Set Of 50 M35 Cobalt Drill Bits - 1-3 Mm - For Drilling On Hardened Steel, Cast Iron And Stainless Steel | Fruugo NZ Set Of 50 M35 Cobalt Drill Bits - 1-3 Mm - For Drilling On Hardened Steel, Cast Iron And Stainless Steel | Fruugo NZ](https://img.fruugo.com/product/5/06/589499065_max.jpg)