Kolvoii CA-TK-017 Bolt Extractor Set, 16-Piece 1/2-Inch Drive CR-MO Steel

Quick overview

When a rounded or rusted fastener holds up a wheel or equipment repair, the Kolvoii CA-TK-017 extractor set gives you a range of sockets designed to grip damaged bolt and nut heads. Its reverse spiral flutes bite into the fastener as you turn, helping you work on worn, frozen, stripped or seized hardware.

The set includes 14 extractor sizes from 8mm to 27mm, plus a 1/2-inch hex adapter and a knockout pin. The extractors are made from CR-MO steel and have a black phosphate finish. A storage case keeps the pieces together between jobs.

For a fastener that is still in good condition, a standard socket is the straightforward choice. When the head is damaged and a regular socket cannot get a secure hold, this extractor set offers a purpose-built alternative for automotive repairs, machinery and other hands-on work.

Tips for day-to-day use

Choose the extractor that fits the damaged fastener, then turn it so the reverse spiral can grip as it engages. The set is designed for use with a 1/2-inch drive impact wrench, ratchet or breaker bar, making it useful across different repair setups. The slim, extended socket profile is intended to reach recessed fasteners and tighter areas, including engine bays and corners where bulkier tools can be awkward.

The included knockout pin is useful after removal: if the fastener remains lodged in an extractor, the pin helps push it free. Keep the sizes organized in the case so the set is ready to take to a repair rather than searching for individual sockets. For jobs that call for a simple socket on an undamaged fastener, use a standard socket, reach for the extractor when worn or rounded edges make gripping the head the main challenge.

Getting the most from it

The 14 sizes cover a broad range of common fastener dimensions: 8mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 19mm, 21mm, 22mm, 24mm and 27mm. Match the socket to the fastener before applying turning force. The set’s 1/2-inch drive format works with compatible hand and powered tools, while the supplied hex adapter adds another way to connect the extractors to a tool.

This is a practical kit to keep with automotive or equipment tools for the occasional stubborn fastener, as well as for repair and assembly work where damaged bolt heads can interrupt progress. Buyers’ feedback is mixed: some find the extractors useful for their jobs, while others report inconsistent results and breakage. That feedback is worth keeping in mind when choosing a tool for a particular repair, the set’s clearest advantage is having multiple extractor sizes and the removal pin together in one case.

Questions before you buy

What sizes are included? The set has 14 extractor sizes: 8mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 19mm, 21mm, 22mm, 24mm and 27mm.

Which tools can I use with it? The set is designed for 1/2-inch drive use with an impact wrench, ratchet or breaker bar. It also includes a 1/2-inch hex adapter for tool connections.

What is the knockout pin for? Use it to push a damaged fastener out if it becomes stuck in an extractor after removal.

Is it worth it?

For DIYers and repair work that can involve rounded, rusted or seized fasteners, this kit brings a useful spread of sizes, a reverse-spiral gripping design and a knockout pin into one portable case. It is especially suited to jobs where a regular socket no longer grips securely and you want extractor options ready for automotive or equipment repairs.