The Blue Spot Tools 4-22mm Step Drill is designed for precision drilling of holes in various materials including aluminium, brass, copper, plastic, steel, and wood. It is manufactured from high-speed steel for enhanced durability and cutting power, and features a titanium coating to minimize friction and heat. The drill has 2mm step increments for precise hole sizing. Orders placed before 2pm on weekdays are dispatched the same day. A VAT invoice is provided with every order.