The Tap HSS 4x0.7 & Drill 3.3mm 2PC Set is a combination kit designed for tapping and drilling small precision holes. The set includes: HSS Tap 4x0.7: A high-speed steel (HSS) tap with a 4mm diameter and 0.7mm thread pitch, ideal for creating internal threads in a 4mm hole. HSS provides durability and sharpness for threading metal, plastic, and other materials. Drill 3.3mm: A 3.3mm drill bit used to create the initial hole before tapping, ensuring a perfect size for threading with the included tap. This set is useful for tasks that involve creating precise threaded holes for fasteners, commonly used in machining, automotive, or DIY projects.