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.