The anodized aluminum positioning squares from Temu are available in 3 different bar lengths (100, 120 and 140mm). Each set comes with 4 squares and 8 adjustable clamping blocks. The bars of the squares measure 5/8″ by 3/4″ and are drilled with a series of 5/16″ holes to accommodate the clamping blocks. The faces of the clamping blocks are 5/8″ by 1″. I’m of the ‘bigger is generally better’ school of thought, but find that the 5/8″ bearing surfaces do providing reasonable registration against work surfaces.

You can attach the squares to stock up to about 2″ thick. The squares have a relief cut on the inside corner to prevent binding on your stock if it’s a bit out of square.

I found these squares to be quite well machined – no flexing, no sharp edges and accurately drilled holes along the bars. However, for the 140mm set I tested all the bars were off by .008″ over their length. I found that this didn’t really affect their functionality. There are metric and Imperial scales engraved on the outside of the bars. I haven’t found any reason to use the scales as of yet. The 1-3/8″ star knobs are a good size unless you have super large hands.

On narrow assemblies you’ll likely want to place the squares on the inside – so that the outside corners of your assembly are fully accessibly for drilling.

These well-made positioning squares will help you get good results with minimal fuss when assembling all but the very largest boxes or cabinets.