Kolvoii 81-Piece Tap & Die Set | SAE & Metric Coverage, M3–M12, #4–1/2\", GCr15 Steel, 60 HRC

Overview

The Kolvoii 81-piece tap and die set is designed as a comprehensive threading solution for workshops, garages, and maintenance bays. It covers SAE sizes from #4 to 1/2 inch and Metric sizes from M3 to M12, including both coarse and fine threads. This versatility makes it suitable for cutting new threads, repairing damaged fasteners, or rethreading stripped holes—useful in automotive, machinery, and general metalworking tasks.

Included components

• 68 taps and dies for broad size coverage
• Long-handle tap wrench
• T-handle tap wrench
• Adjustable die wrench
• Screwdriver and center punch
• Dual pitch gauges
• 5 spiral extractors
• Rugged blow-molded transport case

Durable, accurate construction

Crafted from heat-treated GCr15 bearing steel with Rockwell hardness up to 60 HRC, the tools resist wear and retain cutting accuracy under load. This combination helps keep threads clean and true across repeated rethreading tasks without noticeable deformation.

Precision for diverse materials

Precision CNC-ground cutting teeth produce clean, accurate internal and external threads on steel, aluminum, brass, copper, and cast iron. Optimized tooth geometry reduces friction and cross-threading, enabling smoother operation and steadier progress during hand-guided work.

Useful accessories for efficient repairs

Dual thread pitch gauges help identify thread types quickly, while spiral extractors remove broken bolts without harming surrounding threads—saving time on everyday repairs.

Control and ease of use

Adjustable tap and die wrenches offer secure locking, precise alignment, and steady pressure across multiple sizes. This supports straight, consistent threading and makes fine adjustments more manageable in real-world work.

Organization and portability

The rugged blow-molded case keeps all components neatly organized and easy to transport, making it a practical choice for shop setups, fieldwork, or home garages.

Ideal applications

Well-suited for automotive, machinery, and DIY repairs, this set helps restore stripped threads on bolts, rods, and threaded holes in a range of metalworking contexts. Consider it for routine maintenance, upgrades, and on-the-spot fixes in a workshop or garage.

• All-in-one SAE & Metric coverage with both coarse and fine threads
• Durable GCr15 steel engineered for sustained cutting performance
• Precision CNC teeth for clean threads across materials
• Integrated gauges and extractors to speed up repairs
• Adjustable wrenches for controlled, accurate threading
• Organized, portable kit in a rugged case