UPDATE 11JUL25: I made a mini version for smaller clamps that uses a 3x3 Gridfinity space. Check it out here.

UPDATE 06APR25: I designed a lid to pair with this clamp holder that I think turned out awesome. Check it out here.

Gridfinity holder for Hardell 90 degree clamping squares, but should also work with other brands. Clamps are 5.5" x 5.5". These types of clamps are typically used for keeping cabinets square while assembling.  Holder is 4x4 on gridfinity bases and is 3.15" total height. Fits 4 right angle clamps and all the clamps in the open section.

Thanks for looking!