Based on this product's specifications, here are some alternatives and similar models
Drill bit Irwin HSS cylindrical 4 mm for metal, model 1863348
Summary description:
Irwin HSS cylindrical drill bit 4 mm designed for drilling metal. High-speed steel (HSS) construction provides wear resistance and heat tolerance for cutting through ferrous and non-ferrous metals. Cylindrical shank fits standard chucks; suitable for workshop, maintenance or DIY metalworking tasks requiring precise 4 mm holes.