Likely made from the finest chinesium and therefore a really bad idea to use it on metal, but it's dirt cheap and comes with a centre punch.
Some reviews say they didn't get the entire set pictured so might be worth opening it on delivery to check.
Quality Materials: Forged from titanium coated high speed steel, fully polished, drop forged and heat treated, strong and durable. Comes with 4-Piece HSS Groove Step Drill Bit (3-12/ 4-12/ 4-20mm ). HSS Hex Shank Step Drill Bit Kit are suitable for all kinds of for home DIY power drills.
Hex shank: Most drills or drills with 6.35 mm (1/4 ") mandrel are 6.35 mm hexagon shanks, which can be firmly installed in machine tools and eliminate slippage.
Two-channel spiral groove design: can achieve faster, more stable and smoother cutting. You can automatically chamfer holes to clean the drill.
Easy Drilling: Two-Flute Design for smoother cutting. High Step design let you feel the stop and never drill bigger in mistake.
Multi Purpose: This titanium coated step drill bit set is suitable for drilling of thinner stainless steel, bass,wood,plastic,carbon steel, aluminium plate, iron plate,PVC,fiberglass and other materials.
Easy to carry with a nylon pouch, convenient to storage in bag, car, or at home. Perfect for professional and home use.
what if the metal being drilled was also similarly sourced 🤪