Drilling through metal requires the right type of drill bit as well as proper techniques, including a using a slow drill speed and adding oil to reduce friction and heat.
Drilling through steel or metal
15 Genius Tips To Drill Holes Into Metal
How to Drill a Hole in Metal (1/4 Steel)
How To Drill Metal (Andy's Garage: Episode - 193)
How To Drill Holes In Steel
How to drill in metal
EZARC 5PC Carbide Drill Bit Set, Multi-Purpose Hex Shank Drill Bit for Metal, Masonry, Wood, Block, Brick and Plastic
Learn how to drill through metal!
How to Drill Steel: 15 Steps (with Pictures) - wikiHow
A Step-by-Step Guide to Drilling Holes in Metal
How to drill harden steel
How To Drill Through Metal (DIY)
Metal Drill Bit vs Wood: Identification and Usage Guide
How to Spray Paint Metal & Drill Holes in Metal When Upcycling Furniture