Stubby Drivers and Magnetic Bit Holders

Two cheap tools that solve the same problem from opposite ends. A stubby driver handles the fastener you can reach but cannot get a normal driver above. A magnetic bit holder handles the one you can reach with a tool but cannot get the screw into with your other hand.

Between them they cover most of the fasteners on a car that are annoying for reasons of geometry rather than tightness.

A note on this guide: this rests on how these tools work and where they fail, not on tools assessed here. See how we test.

The problem, as it appears

A screw with something solid a few centimetres above it. Under a dashboard, inside a wheel arch, behind a bumper, in the footwell — anywhere the fastener is accessible and the space above it is not.

A normal driver needs its own length plus your hand above the screw. If that clearance does not exist, the tool cannot engage at all, and the usual response is to try a shorter screwdriver from a kitchen drawer and round the head.

The mirror-image problem: a recess deep enough that you can get a bit to the screw but cannot hold the screw while you start it, because your other hand cannot reach.

Why the multi-bit driver in the drawer disappoints

Because the bit is what fails, and the cheap sets fail there first.

A soft or slightly undersized bit rides up out of the recess under load. That is cam-out, and it rounds the screw head — converting a tight fastener into an extraction job, which is a much larger problem than the one you started with.

The handle contributes almost nothing to this. Which is why the right way round is a cheap driver with good bits rather than an expensive driver with whatever came in the case.

The second reason: length. A general-purpose driver is a compromise on length, and the fasteners that need these tools are exactly the ones where length is the whole problem.

What actually matters

A stubby solves clearance and nothing else

Its only advantage is that it is short, and that is enough to make otherwise impossible fasteners routine.

The trade is leverage. A short handle gives less torque, so a stubby is for turning fasteners rather than for cracking tight ones loose. If it is genuinely tight, that needs a different approach — usually getting the panel off so a proper tool reaches.

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The ratcheting version is worth it in tight spaces

Because the constraint in a confined space is how far you can rotate your wrist, not how hard you can push.

A ratchet turns a fifteen-degree arc into continuous progress, which is the difference between a two-minute job and a ten-minute one. The mechanism adds a little length, which is the trade against the whole point of the tool — so it is worth choosing deliberately rather than assuming.

The magnet is for starting screws, not for holding bits

The underrated half.

Everyone buys a bit holder for the reach. What it actually earns its place doing is holding the screw on the bit while you start it somewhere your other hand cannot go.

That converts a class of fastener from two-handed to one-handed, and it stops the screw disappearing into a cavity on the way in — which is the failure that turns a five-minute job into an hour.

Wipe the bit before every use

The one genuine downside of a magnetic tool, and it causes exactly the failure the tools exist to prevent.

A magnetised bit picks up swarf, grit and metal filings. Those go into the fastener recess when you seat the bit, which prevents full engagement — and partial engagement under load is cam-out.

A wipe takes a second. It is the difference between the magnet helping and the magnet causing the rounded screw.

Bit quality is the whole purchase

Worth repeating because it inverts how people shop.

The failure mode in this area is a rounded screw head, and that comes from the bit — soft, worn, or a size that nearly fits. A bit that fills the recess completely and is hard enough not to deform is what prevents it.

Push hard into the head while turning. Most cam-out is insufficient axial pressure rather than excessive torque.

The version of this that costs the most when it goes wrong is on a bumper — number plate screws and corrosion covers why those in particular are lost to cam-out rather than to the corrosion itself.

These are for fasteners, not for trim clips

The one place they do damage, and it is worth stating plainly.

A metal driver used to lever a trim clip marks the panel and cracks the clip. Nylon trim tools are shaped to spread the load and soft enough not to mark — a different job with different tools.

Trim removal tools: stop using screwdrivers covers that properly.

When the screw goes missing anyway

It will, eventually, and usually into somewhere you cannot see.

Recovering dropped bolts from an engine bay covers the techniques that work.

Where a powered tool takes over

If the job is thirty low-torque fasteners rather than three awkward ones, the answer is a different tool — a cordless ratchet with a bit adapter. These two are for access problems; that one is for repetition.

The order to work in

1. Establish whether it is clearance or reach — they need different tools.
2. Wipe the bit before it goes near the fastener.
3. Choose a bit that fills the recess, not one that nearly fits.
4. Push hard into the head while turning.
5. Stop at the first slip. A partly rounded head is still recoverable; a fully rounded one is not.
6. Use nylon tools on trim clips, not these.
7. Consider removing the panel if the fastener is genuinely tight rather than merely awkward.

The mistake to avoid

Using a nearly-right bit because it is the one in your hand. It engages, it turns, and under load it rides up out of the recess and rounds the head — turning an awkward fastener into an extraction job in a place you already could not reach properly. The correct bit is usually two feet away in the same case.

The second mistake is applying more torque when a bit starts to slip. Cam-out is caused by insufficient axial pressure rather than insufficient turning force, so pushing harder into the head is the fix and turning harder is what completes the damage. If it slips twice, stop and change the approach rather than the effort.