Snap-on RAT72A Low-Profile Socket Set: A Specialty Tool Worth Hunting For

Introduction

Some tools exist to do everything, and a few exist to do one thing exceptionally well. The Snap-on 12-piece 1/4-inch drive 6-point metric Flank Drive low-profile socket set, better known by its set number 112RTSM and the socket marking RAT72A, falls firmly in the second camp. It is a specialty solution for fasteners that sit in recesses too shallow for any standard socket to reach.

The set is genuinely hard to find detailed coverage of online, which is part of what makes it interesting. It is also expensive new, listed at around $294.80 from Snap-on, which explains why so few people own one despite its clever design.

Who This Product Is For

This is a special-purpose tool. The sockets are dramatically shorter and thinner than regular sockets, so they reach fasteners buried in tight, recessed locations where even a standard socket head would not begin to fit. If you work on machinery, vehicles, or equipment with sunken fasteners, that capability can save serious time and frustration.

If your fasteners are all accessible, though, a conventional socket set handles the job just as well for a fraction of the price. That price, close to $300 for a 12-piece set, is likely why the set remains rare outside professional circles. There are other ways to solve this problem, just not always with the same build quality.

What You Get in the Case

The set includes twelve pieces: low-profile sockets from 5 mm up to 13 mm, including a 5.5 mm and a 1/4-inch bit driver, plus a low-profile ratchet. The sockets are 6-point metric with Flank Drive geometry, and notably they are pass-through, so a long fastener can slide through the socket body when the situation calls for it.

The sockets are also inexpensive to add individually at roughly $20 each from Snap-on, and the range tops out around 15 mm, so it is possible to expand the set later if your work demands larger sizes.

Why Low-Profile Design Matters

The whole point of this set is height. A standard socket sticks up well above the fastener even before you account for its wall thickness, while these sit nearly flush. The difference is easy to appreciate side by side: the low-profile socket barely rises above the fastener it is turning.

The bit driver position is another highlight. The square drive doubles as a bit holder, so you can run screwdriver bits or short accessories through the same low-profile footprint, effectively turning the ratchet into a compact driver in confined spaces.

Build Quality and the Ratchet

The ratchet in this set is the RAT72 reversible model, and it feels silky smooth in use. Socket retention uses a small internal spring rather than a conventional ball detent, and sockets pop out with a simple push. It is a slightly unusual mechanism if you have never used one, but it works cleanly.

Socket extraction takes a moment to get used to. There is no traditional release lever; you simply pull or push the socket free. Once you understand that, the system feels simple and elegant rather than quirky.

The example examined here was effectively unused, wrapped in original Snap-on truck-style packaging with not a fingerprint on it. Even the smallest 5 mm socket carries clear stamping, a nice touch on tools this small.

Things to Consider Before Buying

The obvious consideration is price. At nearly $300 new, this is an investment in a niche capability, not a general-purpose upgrade. Snap-on also offers a 12-point version of the set, and a larger foam-cased variant bundled with a selection of bits and accessories if you want a more complete kit.

On the plus side, individual sockets remain around $20, so filling out the metric range toward the 15 mm maximum is straightforward if you later need more coverage.

Buying Advice

Finding one of these second-hand can transform the value equation dramatically. One example surfaced at a pawn shop for $90, less than a third of the new price, complete with its original Snap-on-style wrapping and in essentially unused condition. Shops near aviation maintenance areas and other industrial neighborhoods can be surprisingly good hunting grounds for exactly this kind of professional-grade tool.

Patience matters here. This is the kind of set that a buyer wanted for a long time before the right deal appeared. Keep looking, and deals do surface.

Conclusion

The Snap-on RAT72A low-profile socket set is a beautifully executed special-purpose tool. For fasteners in tight recesses, it does what no standard socket can, with a smooth reversible ratchet and a pass-through design that adds real flexibility. The high new price keeps it off most benches, but for those who genuinely need low-profile capability, or who stumble on a used set at the right price, it is a genuinely satisfying addition to a toolbox.