KNUKPE 77-Piece Rivet Nut Tool Kit, M3–M12, Carbon Steel Mandrels

Seven metric mandrel sizes make this KNUKPE rivet nut kit useful for projects that call for different threaded fasteners. With sizes from M3 to M12 and matching rivet nuts in the set, you can select the size that suits the job instead of building your supplies around just one size.

Use the mandrels manually for controlled work or with a suitable drill/driver when you want a quicker approach on a larger task.

Tech summary

• Set: 77 pieces, including 7 mandrels and 70 rivet nuts
• Sizes: M3, M4, M5, M6, M8, M10 and M12
• Rivet nuts: 10 per size, zinc-plated carbon steel
• Mandrels: Carbon steel
• Dimensions: 25 x 10 x 3 centimetres
• Weight: 660 g

The seven metric sizes cover a useful range of fastening needs, from smaller fittings to larger fixings. Each size comes in its own bag with the corresponding rivet nuts, making it easier to identify what you need and keep the sizes organized between jobs. The zinc-plated finish on the nuts helps resist rust and corrosion in everyday working conditions, while the carbon steel mandrels are designed for wear resistance during repeated fastening work.

For repairs or fabrication involving sheet metal, frames, shelving, furniture, machinery or equipment, rivet nuts provide a way to add a threaded fastening point. The assortment is also suited to automotive and RV projects where threaded inserts are needed. Compared with buying a single size for one specific job, this kit offers several metric options together, that can be helpful when a project involves different hole or fastener sizes.

Compatibility

The mandrels can be operated manually with a compatible wrench or connected to a suitable electric screwdriver or drill/driver. Manual operation offers a controlled approach for individual installations, while a suitable powered tool can help speed up work across a larger batch. The set is an accessory kit rather than a complete rivet nut gun, and the tools used to operate it are not included.

Usage tips

Choose the mandrel and matching rivet nut size for the fastening task, keeping each size’s bag together for easier selection and storage. Use the manual method when you want to work at a measured pace, or a suitable drill/driver when the job calls for faster installation. Keeping the assortment organized also makes it simpler to move between sizes during a repair or build without mixing the nuts.

In a practical workshop scenario, the set can help with adding threaded attachment points to sheet metal or metal frames, whether the work is a one-off furniture repair or part of a broader equipment project. Having M3 through M12 available gives you flexibility across those tasks while keeping the matching mandrels and nuts in one kit.

Should you buy it?

Worth considering if your repair, fabrication or maintenance work calls for metric rivet nuts in more than one size. The seven mandrels, 70 matching nuts and choice of manual or suitable powered operation make this a practical set for automotive work, sheet metal, furniture and metal-frame projects. It brings a broad M3–M12 selection together in an organized format, so you can choose the size and working method that fit the task.