At first glance, the Squi.Jig 4 ½-Inch Mini Pro looks like many other micro or mini rafter squares on the market. It has all the hallmarks of quality manufacturing: clean machining, crisp and easy to read markings, accurate scribe points, and a ³/16-inch heel that’s handy for decking, siding, and general layout work.
But anyone with a keen eye will immediately notice what truly sets it apart—the adjustable heel.
If you work with steel or aluminum trim and flashing, you already know a standard 7 ½-inch square isn’t always the most efficient tool. It simply doesn’t fit into many of the profiles we deal with day to day. This is where the Mini Pro’s small size earns its keep.
Aron Jones
Set screws in the heel allow easy offset adjustment to different four options. This allows the user to tailor the square to what they need for the task at hand.
The heel can be adjusted in several ways:
- Centered or removed entirely
- Offset ¼ inch on one side and ½ inch on the other
- Offset ⅛ inch and ⅝ inch—a most useful combination
That ⅛-inch offset is the real gem. It allows the square to sit almost perfectly flat, which improves layout accuracy by helping to prevent your pencil from wandering underneath the blade. At the same time, the ⅛-inch heel still registers cleanly against a hemmed metal edge, giving you a positive reference point even on thin stock.
Aron Jones
By having the heel flush to one side the user can make scribe lines on an inside corners.
If you’re looking to add a versatile 4 ½-inch square to your kit, this carpenter can confirm it’s a solid choice. From drawer faces to J trim to custom flashings (where I have really seen a difference), the Squi.Jig Mini Pro adapts to whatever situation you throw at it. It costs $70 stand-alone and with a built-in spirit level is $80. This tool and their other products are available in a range of colors and are available at Squijig.com.
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