# What is an oscillating multi-tool used for?

Source: https://drillandbit.co.uk/blog/what-is-a-multi-tool-used-for
Published: 2026-10-12
Publisher: Drill and Bit

**In short:** An oscillating multi-tool swings a small blade a few degrees back and forth very quickly, so it can make flush cuts, plunge into floors and walls, remove grout and old sealant, scrape and sand into corners. It is the go to tool for awkward cuts in renovation work where a saw will not fit.

Oscillating multi-tools are often bought for one job, such as trimming a door frame for new flooring, and then used for dozens more. They are slower than a dedicated saw or sander, but they reach places no other tool can. This guide explains how they work, what they are used for and how to get good results.

## How it works

The motor drives an eccentric that rocks the tool's output shaft back and forth through a small angle, typically around 3 to 4 degrees, many thousands of times a minute. The Bosch GOP 18V-34 lists a 3.4 degree angle, and speed ranges such as 8,000 to 20,000 per minute appear in listings like the Metabo MT 18 LTX BL QSL.

Because the blade only moves a short distance, it cuts in a controlled way and can be pressed into the middle of a surface without a starting hole. It also tends to stop rather than kick if it meets a firm obstruction, though it will still cut skin.

## Common jobs

These are the jobs multi-tools are bought for most often in UK renovation and repair work.

- Undercutting door frames and architraves so new flooring slides beneath.
- Plunge cuts in floorboards to lift a section for pipe or cable access.
- Cutting openings in plasterboard for sockets and downlights.
- Removing grout between tiles before regrouting.
- Cutting off nails, screws and pipes flush with a surface.
- Scraping old sealant, adhesive and flooring.
- Detail sanding in corners and on window frames.

## Choosing the right blade

The blade does the work. Plunge cut blades for wood and for wood with nails, segment blades for flush and curved cuts, carbide grit blades for grout, scrapers for adhesive and a triangular sanding pad for detail sanding. Bi-metal blades handle nails and thin metal. Most modern tools use Starlock family mounts; see [multi-tool blade fittings](https://drillandbit.co.uk/blog/multi-tool-blade-fittings).

| Blade | Use |
| --- | --- |
| Wood plunge blade | Door frames, floorboards, timber |
| Bi-metal plunge blade | Wood with nails, plastic pipe, thin metal |
| Segment blade | Flush cuts, longer straight cuts |
| Carbide grit blade | Grout and soft masonry |
| Scraper | Sealant, adhesive, old flooring |
| Delta sanding pad | Corners and detail sanding |

Blade types and uses

## How to use one

Fit the blade, set a low speed to start, and let the tool reach speed before touching the work. Press lightly; too much pressure stalls the oscillation and heats the blade. For plunge cuts, rock the blade gently and let it cut. For flush cuts, lay a spacer, such as an offcut of the new flooring, on the floor and rest the blade on it.

1. Fit the correct blade and lock it.
2. Set a low or middle speed.
3. Start the tool before contacting the work.
4. Press lightly and let the blade cut.
5. Move the blade slightly side to side to clear dust in deep cuts.

## Corded or cordless?

Cordless tools are convenient and many are now as strong as corded ones, such as Fein's cordless AMM 500 Plus. Corded tools like the Fein MM 500 Plus suit long sessions, such as removing grout from a whole bathroom. Choose cordless on your existing battery platform for occasional use.

Compare models in our [oscillating multi-tool guide](https://drillandbit.co.uk/best/best-oscillating-multi-tools).

## Vibration, dust and noise

Multi-tools vibrate and can be noisy, and grout and plaster dust contains silica. Better tools have anti vibration systems. Take breaks on long jobs, connect extraction where possible and wear a suitable mask, eye and ear protection. HSE publishes guidance on hand-arm vibration for regular users.

Note: Keep fingers away from the blade, as it can cut skin even though it is less aggressive than a saw. Check for hidden cables and pipes before plunging into walls or floors. Wear eye, ear and dust protection and follow the manual and HSE vibration guidance.

## Limits

A multi-tool is slow for long straight cuts and large areas of sanding. Use a circular saw, track saw or sander for those. It is a problem solver, not a replacement for them; see our [cordless circular saw guide](https://drillandbit.co.uk/best/best-cordless-circular-saws) for bigger cutting jobs.

## Frequently asked questions

**Can a multi-tool cut metal?** Thin metal, nails, screws and pipes, yes, with a bi-metal or carbide blade. It is slow on thick steel.

**Can I use a multi-tool to cut tiles?** Carbide grit blades can remove grout and cut small notches in tiles, but a tile cutter is better for full cuts.

**Why does my blade get hot?** Too much pressure or a blunt blade. Press lightly and replace worn blades.

**What speed should I use?** Lower speeds for metal, plastics and precise starts; higher speeds for wood and grout. Test on scrap.

## Buying guides on this topic

- https://drillandbit.co.uk/best/best-oscillating-multi-tools
- https://drillandbit.co.uk/best/best-power-tool-kits
- https://drillandbit.co.uk/best/best-cordless-circular-saws

## Sources

- [HSE: hand-arm vibration](https://www.hse.gov.uk/vibration/hav/)