The Woodpeckers MDSQ-21 Mini in-DEXABLE Double Square is a compact woodworking layout and measuring square for small-part setup, inside-corner checking, and bench-top reference work. This is a double square designed for precision layout and squareness checks on smaller workpieces. Model Number: MDSQ-21.

What makes this style of square useful is simple: it gives you the control of a machinist-style reference tool without the bulk of a full-size framing or combination square. On drawer parts, small boxes, jigs, router table setups, and trim pieces, a smaller square is usually the better call because it sits flat, reads fast, and does not fight you in tight spaces.

The Woodpeckers Mini in-DEXABLE Double Square uses the brand's in-DEXABLE system format, which centers on a removable blade and matching head. That matters if you already use the Mini in-DEXABLE platform, because the system approach lets you work with a common blade format instead of treating every square as a completely separate tool. Based on the product images, the inch version uses an inch blade, and Woodpeckers calls out that inch heads require inch blades.

The scale details are practical, not just nice on paper. The blade shows laser-engraved graduations with 1/16 inch markings on one edge and 1/32 inch markings on the other, which gives you a fast side for rougher setup and a finer side when you need to split the difference on layout. Woodpeckers also states accuracy to ±0.004 inch total cumulative error, which is the kind of spec serious woodworkers actually care about when they are checking setup rather than just drawing a line.

In use, this double square makes the most sense for furniture builders, cabinet guys, trim carpenters, and shop users who spend more time on fit and reference than on broad jobsite measuring. The product images specifically show the tool checking the inside of a small box assembly, which is exactly where a mini square earns its keep. A bigger square can get in the way there. This one is sized for the work.

Build-wise, the visual details match what Woodpeckers is known for: machined metal construction, a compact locking head, a clearly engraved blade, and a layout-focused design that is meant to live on a bench and get used constantly. It is also marked Made in USA, which will matter to buyers who prefer American-made woodworking layout tools.

If you want one tool for rough carpentry, this is not it. If you want a precise mini square for joinery, small assemblies, router table checks, and fine woodworking layout, the Woodpeckers MDSQ-21 is much more in its lane. That is who this tool is built for, and that is where it makes sense.

Woodpeckers MDSQ-21 Mini in-DEXABLE Double Square for Fine Layout Work

This is the kind of shop tool you buy once you are tired of wrestling full-size squares on small parts.

• Who it's for: Woodworkers, cabinetmakers, and anyone doing precise layout on small assemblies, jigs, and bench-top setups.
• Why it stands out: The compact size makes sense for the work, the engraved inch blade is easy to read, and the Mini in-DEXABLE system format gives it more long-term usefulness than a fixed mini square.
• Worth knowing: This is a precision layout tool, not a general jobsite square. It makes the most sense in a woodworking shop where accuracy and access matter more than overall reach.

• What kind of tool is this? It is a mini double square used for measuring, layout, and checking squareness on smaller woodworking parts and assemblies.
• What blade length is shown for this Mini in-DEXABLE format? The product images show a 4 inch blade for the Mini in-DEXABLE Double Square system.
• What graduations are on the blade? Woodpeckers shows 1/16 inch graduations on one edge and 1/32 inch graduations on the other.
• Is it made in the USA? Yes. The product imagery states Made in USA.