Woodpeckers DSQ-XL-20 in-DEXABLE Double Square XL - 12 in. Blade is a precision woodworking layout square built around Woodpeckers' interchangeable in-DEXABLE system. This is a double square designed for measuring, layout, and scribing accurate lines in woodworking and shop setup. Model Number: DSQ-XL-20. If you want the clean, compact feel of a double square but need more reach than a short blade gives you, this is the version to look at.

The big story with the in-DEXABLE system is not just that it measures, but how it helps you mark work faster. The stainless blade uses laser-cut scribing guides on 1/16 inch centers, sized to guide a marking tool parallel to the edge of the stock. Round indexing holes in the center of the blade let the head register to the closest full inch, which gives those scribing guides a repeatable starting point. On the bench, that means less hunting for a setting and more time actually laying out joinery, offsets, and machine lines.

Woodpeckers also put real effort into the blade itself. The scales are laser engraved to an accuracy of plus or minus .004 inch, with 1/16 inch graduations on one edge and 1/32 inch graduations on the other. Those are the kinds of details that matter when you are checking machine setup, transferring dimensions, or laying out parts that need to fit the first time. You are not just getting a ruler with a red head attached. You are getting a layout tool built to do repeatable work in a cabinet shop, furniture shop, or serious home shop.

The Double Square head is the simpler, more compact option in the in-DEXABLE family. Woodpeckers specifically positions it as the better choice when you are not dealing with miters and do not need the 45 degree function of a combination square. That matters because a lot of woodworking happens at 90 degrees: checking stock, setting fence offsets, striking shoulder lines, and verifying setups at the table saw, jointer, router table, or drill press. The XL format gives you a 12 inch blade for more reach across wider parts while keeping the straightforward double-square form factor.

Another practical detail is the sliding tab that supports the head while it hangs off the edge of your workpiece. That may sound small until you are trying to hold a square steady on a board edge while marking with the other hand. Added support helps the head sit more predictably, especially when you are working near the edge of a panel or referencing stock that is already milled and ready for layout.

Because this is part of the Woodpeckers in-DEXABLE Square System, it also fits into a larger interchangeable platform. The product page states that the 6 inch, 12 inch, and 18 inch blades fit all four heads, as well as the XL Combination and XL Double Square heads. That gives this measuring and layout tool more long-term value than a one-piece square. If you already own other in-DEXABLE heads or want to expand later, the system is built for that kind of flexibility.

This model is best for woodworkers who care about repeatable layout more than bare-minimum measuring. It makes sense for furniture builders, cabinetmakers, trim carpenters working in the shop, and serious DIY users who want a square that can measure, register, and scribe with less setup time. If your work is mostly straight 90 degree layout and you want more reach than a 6 inch square, the DSQ-XL-20 hits a useful middle ground without stepping into the more complex combination-square head style.

Simple head, serious layout square

The Woodpeckers DSQ-XL-20 in-DEXABLE Double Square XL - 12 in. Blade makes a lot of sense for woodworkers who mostly live at 90 degrees and want more reach without moving to a bulkier square style.

• Who it's for: Woodworkers, cabinet shops, and serious DIY users who need a precision measuring and layout tool for repeated bench work, machine setup, and clean scribe lines.
• Why it stands out: The indexed blade and built-in scribing guides are the real advantage here. They turn this from a basic square into a faster layout system.
• Worth knowing: This is the double-square style, so it is the right call when you do not need 45 degree combination-square functions. If you want miters too, step up to the matching combination square head.

• What kind of tool is this? It is a double square used for measuring, layout, and scribing in woodworking and shop setup.
• How long is the blade? This DSQ-XL-20 version includes a 12 inch blade.
• Does it use interchangeable parts? Yes. It is part of the Woodpeckers in-DEXABLE Square System, which is built around interchangeable heads and blades.
• What graduations are on the blade? The blade has 1/16 inch graduations on one edge and 1/32 inch graduations on the other, with laser-cut scribing guides on 1/16 inch centers.