Which Sander Do You Need?

There are five kinds of sander in the aisle and they look interchangeable. They are not: two of them are finish tools, one is a shaping tool that will wreck a workpiece if you treat it like a finish tool, one is for corners, and one costs nothing and does the final step better than any of them.

The short answer, if you want it now: buy a 5-inch random orbital sander and a cork block, and stop. Here is why, and what each of the others is genuinely for.

Random orbital sander — the one to own

A round pad that spins on its axis while the axis itself moves in a small orbit. The two motions combine so that no point on the abrasive ever repeats the same path across the wood.

That randomness is the whole point. Because there is no repeating pattern, there is no repeating scratch, which means a random orbital can remove real material at 80 grit and still leave a surface that finishes cleanly at 180. No other power sander does both jobs.

• Best at: everything a beginner sands. Faces, panels, edges, tabletops.
• Bad at: inside corners, narrow rails, anything smaller than the pad.
• Watch out for: pressing down. The pad tips, the edge digs in, and you get the exact swirl marks you were trying to avoid.

Our random orbital sander roundup covers the five worth buying, and sanding discs and grits explained covers the consumables, which cost more over time than the tool does.

Sheet sander (quarter-sheet / finishing sander) — the corner specialist

A square or rectangular pad that vibrates in a tight orbit, taking ordinary sandpaper cut to size. Cheap, light, and quiet.

Its advantage over a random orbital is geometric: the pad has square corners, so it reaches into the inside corner of a frame or a carcass where a round pad cannot. Its disadvantage is that every point on the pad repeats the same small loop, so it leaves a faint uniform swirl and removes material slowly.

• Best at: inside corners, light final passes, small flat surfaces.
• Bad at: removing material. It is a finishing tool only.
• Buy one if: you build boxes and frames with internal corners. Otherwise skip it.

Belt sander — the shaping tool

A loop of abrasive running continuously over two drums. It removes material astonishingly fast in one direction, and that is its entire character.

A belt sander is not a bigger finishing sander. It is closer to a plane made of sandpaper. Leave it in one place for two seconds and you have a hollow; tilt it and you have a rounded edge; run it across the grain and you have scratches that take three grits to remove. Beginners buy one thinking it will speed up finishing, and it removes their workpiece instead.

• Best at: flattening rough stock, leveling a glued-up panel, aggressive shaping, sanding a floor.
• Bad at: everything a beginner actually needs.
• The alternative: a hand plane levels a panel faster, quieter, with total control and no dust.

Detail sander (mouse / corner sander) — narrow but real

A small triangular pad that vibrates. It exists to get into places nothing else fits: the inside of a small box, between the spindles of a chair, into the corner of a rebate.

It removes material slowly, the triangular pads wear out at the tip long before the rest, and it is genuinely irreplaceable for the specific jobs it does. Buy one when you meet a job you cannot sand, not before.

A block and your hand — the last step

The final pass on almost any surface should be by hand, with the paper wrapped around a firm block, sanding along the grain.

There is a specific reason. A random orbital leaves faint circular scratches that you cannot see on bare wood and can see very clearly once stain or oil goes on. A light hand pass along the grain at the same grit erases them by replacing them with scratches that run in the direction the eye expects.

A cork block is worth the two dollars over a folded sheet: it stays flat, so it does not round over crisp edges the way finger pressure does. Sanding sponges do the same job on profiles and curves, where a hard block cannot follow the shape.

The comparison, in one place

• Flat panels and tabletops — random orbital, then a hand block along the grain.
• Inside corners of a frame or box — sheet sander, or a block with a sharp square corner.
• Curves and profiles — sanding sponges, or a shaped card scraper.
• Leveling a rough glued-up panel — hand plane first, then random orbital. Belt sander only if you already know how to drive one.
• Removing a finish or paint — random orbital with coarse discs, replaced often, or a chemical stripper.
• Tiny recesses and spindles — detail sander, or folded paper and patience.

Dust is the real hazard here

Sanding produces the finest dust in the shop — particles small enough to stay airborne for hours and to get well past a loose paper mask. It is also the tool you use for the longest continuous stretches, which is exactly the wrong combination.

Use a sander with a working dust port and connect it to a shop vac; the collection bags supplied with cheap sanders catch a fraction of what comes off. Wear a rated respirator rather than a nuisance mask, open the door, and read dust collection for a small shop for the garage-specific setup. A fan in the doorway blowing outward, as covered in heating and cooling a garage workshop, clears the air faster than anything else you can afford.

What to buy

One machine, one block, and enough abrasive that you actually change it when it is worn — which is the real determinant of how well any sander works.

Tool	Why you need it	Price
Bosch ROS20VSC 5 in Random Orbit Sander	The random orbital to buy if you buy one sander. Low vibration and a dust port that genuinely works.	$99.00
Skil SR211601 5 in Random Orbital Sander	The budget random orbital. Does the same job with more vibration and a shorter life.	$37.00
Diablo Hook and Lock ROS Sanding Discs, 5 in, 120 Grit, 50-Pack	Fifty discs of the grit you use most. Worn abrasive is why sanding feels slow.	$22.97
Scottchen Cork Sanding Block, 4-1/4 x 2-3/8 x 1-3/16 in	For the final pass along the grain. Stays flat, so it will not round over a crisp edge.	$9.99
Romeda 8-Pack Sanding Sponges, 60/80/120/220 Grit	For curves, profiles and eased edges where a hard block cannot follow the shape.	$5.99
Starter kit subtotal		$174.95

Live Amazon prices as of August 31, 2026; they change, and we don’t display stale numbers — a tool with no live price shows “Check price” and is left out of the subtotal. #ad How we’re funded.

The honest summary

One random orbital sander covers about ninety percent of what a first shop sands. Add a cork block for the last pass, sanding sponges for shapes, and buy nothing else until a specific job stops you.

And before you buy a second sander, try a card scraper. On flat solid wood it does the finishing job better than any machine here, costs about as much as a pack of discs, and puts nothing in the air.