The Tap HSS 10x1.5 & Drill 8.5mm 2pc Set is a set designed for threading and drilling operations. It includes a 10x1.5 HSS tap, which is used for cutting internal threads in materials like metal, and an 8.5mm drill bit designed to create the hole size required for the tap. The HSS (High-Speed Steel) material ensures durability and resistance to wear, making this set ideal for use in tough materials such as steel or aluminum. This 2-piece set is perfect for creating threaded holes with precise dimensions for bolts or screws in machining or repair applications.