Key features

• •All-in-One SAE & Metric Threading Kit：Kolvoii 81-piece tap and die set includes both SAE (#4–1/2") and Metric (M3–M12) coarse and fine threads. Designed for cutting, repairing, or rethreading threads—versatile for fastener or hole repair task
• •Industrial-Grade GCr15 Steel: Made of industrial-grade GCr15 bearing steel, heat-treated to 60 HRC for exceptional wear resistance and strength. Withstands high torque without deformation. Engineered to ultra‑tight tolerances, it delivers the precision and reliability professionals demand
• •Precision CNC Machined Teeth: CNC-ground cutting edges provide clean and accurate threads across materials like steel, aluminum, brass, copper, and cast iron. Reduces friction and cross-threading for smoother, faster thread repair
• •Dual Pitch Gauges & Extractors: Includes both metric and SAE pitch gauges for fast thread identification. Spiral flute extractors (EZ-Out type) help remove broken bolts and studs easily without damaging existing threads, saving time on repairs
• •Adjustable Tap & Die Wrenches: Adjustable wrenches fit multiple tap and die sizes with secure locking and fine-tension control for precise alignment and steady threading under load
• •Complete Accessory Kit: 68 Taps and dies, long handle tap wrench, T-handle tap wrench, adjustable die wrench, screwdriver, metric and SAE thread pitch gauges, centre punch, 5 spiral flute extractors—all neatly stored in a rugged blow-molded case