Kolvoii 61-Piece Thread Chaser Set — Metric, UNC & UNF Repair Kit with Color-Coded Taps, Dies and Pitch Gauges

Kolvoii's 61-piece Thread Chaser Set is a complete metric, UNC and UNF thread-restoring kit designed to quickly clean, repair and preserve damaged fastener threads across engines, fittings and machinery.

This kit combines color-coded taps, dies, three profile files and pitch gauges in a rugged case so you can identify sizes fast, align threads precisely and restore reliable fastening without replacing parts. Each tool is heat-treated carbon steel with corrosion-resistant coatings, making it durable for shop or fieldwork. The selection covers common automotive, plumbing and industrial sizes to handle spark plugs, bolts, studs and threaded holes in both imperial and metric systems.

What sizes are included and which standards do they cover?

The set includes 61 pieces that span SAE/imperial (UNC and UNF) and a wide range of metric pitches. Sizes are color-coded—silver for UNC, black for UNF and gold for metric—so you can quickly pick the correct tap or die. Two pitch gauges (standard and metric) help you verify thread form before working.

• UNC (silver): 5/8"-11, 9/16"-12, 1/2"-13, 7/16"-14, 3/8"-16, 5/16"-18, 1/4"-20
• UNF (black): 5/8"-18, 9/16"-18, 1/2"-20, 7/16"-20, 3/8"-24, 5/16"-24, 1/4"-28
• Metric (gold): M6-1.0, M6-1.25, M7-1.0, M8-1.0, M8-1.25, M8-1.5, M10-1.0, M10-1.25, M10-1.50, M11-1.50, M12-1.25, M12-1.50, M12-1.75, M14-1.50

How does this kit restore threads without damaging parts?

Thread chasers are designed to clean and reform thread profiles rather than cut away metal like single-purpose taps. Kolvoii's chasers are heat-treated for hardness and use profiles tuned for rethreading, which reduces the risk of oversize cuts or weakened threads. Files and gauges included let you align and verify threads before final chaser insertion.

• Chasers re-form and clean instead of aggressive cutting
• Three thread restorer files for mismatch or seat preparation
• Pitch gauges to confirm thread type and prevent cross-threading

What tools and materials come in the case for quick roadside or shop repairs?

The blow-molded case organizes every piece so mechanics can grab the right tool fast. Hex-shaped, color-coded taps and dies accept common wrenches and sockets, making the kit compatible with tools already in your toolbox. Protective coatings and heat treatment extend tool life for repeated use.

• 28 thread chaser taps and 28 thread chaser dies, color-coded
• 3 profile restoration files for damaged or corroded starts
• 2 thread pitch gauges (standard and metric) plus labeled slots

Where will this kit be most useful and what won't it replace?

This set excels at restoring worn, corroded or slightly damaged threads on spark plug holes, bolt holes, fittings and fasteners, saving time and parts. It isn't a substitute for thread cutting when redesigning parts or for helicoil-style inserts when a hole is severely stripped; in those cases a rethreading insert or machine-threading operation may be needed.

• Great for cylinder heads, engine blocks, plumbing fittings, brackets
• Not intended to create new threads in oversized or extensively damaged holes
• Use before considering inserts to confirm if a simple chase will restore fit

Who is this for: Kolvoii's 61-piece Thread Chaser Set is built for mechanics, maintenance technicians, machinists, plumbers and hands-on DIYers who need a portable, reliable solution to clean and restore both metric and imperial threads. If you service engines, equipment or household fittings and want to avoid replacing components just because threads are fouled, this kit gives a durable, organized set of tools for fast thread recovery in the shop or on the road.