The Festool DTS 400 REQ-Plus Finish Delta Sander is a corded finish sander built for detailed sanding where a larger pad gets in the way. This is a finish delta sander designed for fine sanding small surfaces, edges, and tight corners. Model Number 577520. If you spend your time smoothing window frames, cleaning up inside corners, sanding painted trim, or working on vertical and overhead pieces, this is the kind of sander that earns its spot fast.

What matters most here is control. The delta-shaped pad reaches into places a standard finish sander cannot, and the short 2 mm stroke is aimed at surface quality, not aggressive stock removal. The variable speed range of 6,000 to 12,000 RPM gives you room to slow down for sensitive surfaces or keep the pace up when you are blending edges, sanding veneer, or prepping wood before finish. Festool also uses electronic control to keep power delivery consistent, which helps the scratch pattern stay more even as load changes.

The 250 watt motor gives this sander enough muscle for real finish work without making the tool bulky. Festool specifically positions it as a one-handed sander, and that matters on trim, face frames, narrow parts, and awkward angles where a bigger machine feels clumsy. The compact body, rubberized grip areas, and balanced layout are built to reduce fatigue, especially on vertical panels and overhead work where poor balance shows up quickly in your wrists and shoulders.

For finish sanding, vibration control is not just a comfort feature. It affects how steady you can keep the tool on the surface. Festool's vibration-stop balancing helps the pad stay composed, which makes it easier to maintain full pad contact and avoid uneven pressure near edges. That is a big deal when you are trying to leave a clean surface on painted parts, natural wood, or veneered stock that will show every scratch once finish goes on.

Dust handling is another strong point. The Festool DTS 400 REQ-Plus Finish Delta Sander uses an interlocking dust port that works with Festool CT connectors for a more secure connection during sanding. If you are tied into a dust extractor, you get better dust capture at the source. If you are doing quick punch-list work or working where an extractor is not practical, the included reusable dust bag gives you a cleaner fallback than sanding wide open. Either way, keeping dust under control helps protect the finish, the abrasive, and your work area.

This sander also fits the broader Festool system approach. The interchangeable 4 in x 6 in delta sanding pad works with StickFix style hook and loop abrasives for quick grit changes, and the included protector helps you sand close to adjacent surfaces without beating them up. The Plug-it detachable cord is another practical detail on the jobsite. It makes storage easier, simplifies cord replacement, and fits the way many shops and crews already work with Festool corded tools.

Who should buy it? Finish carpenters, cabinet installers, painters doing prep work, remodelers, and woodworkers who regularly sand corners, profiles, frames, and edge-heavy parts. Serious DIY users will appreciate it too, but this is not a cheap throwaway detail sander. It is for people who care about finish quality, cleaner sanding, and better control in tight spaces. If most of your sanding happens on broad flat panels, a larger finish sander may make more sense. If your work lives around corners, trim, and detail surfaces, this is the right shape for the job.

Festool DTS 400 REQ-Plus Finish Delta Sander Means Control Where Other Sanders Get Clumsy

If your work keeps putting you in corners, on trim, or up on vertical pieces, this sander makes a lot more sense than trying to force a larger finish sander to do detail work.

• Who it's for: Finish carpenters, painters doing prep, cabinet and furniture guys, remodelers, and serious DIY users who need clean sanding in corners and along edges.
• Why it stands out: The delta pad shape, fine 2 mm stroke, solid dust extraction setup, and one-handed balance make it a purpose-built detail sander instead of a compromise tool.
• Worth knowing: This is a finish-focused machine, not a heavy stock-removal sander. It shines when surface quality and access matter more than brute-force removal speed.

• Is this a corded or cordless sander? It is a corded 120 VAC sander and uses Festool's Plug-it detachable power cord system.
• What kind of sanding work is it made for? It is built for fine sanding on small surfaces, edges, tight corners, window frames, and other detail areas, especially on vertical or overhead work.
• Can it connect to dust extraction? Yes. It has a 27 mm interlocking dust port designed to work with Festool CT connector style dust extraction.
• Does it use a standard rectangular pad? No. It uses a 4 in x 6 in delta-shaped sanding pad for improved access in corners and along edges.