Gridfinity-compatible holder for a set of SAE t-handle hex wrenches. Sizes 3/32, 7/64, 1/8, 5/32, 3/16, 7/32, 1/4. Mine are from Gearwrench but that doesn't matter at all to the design, so long as your handles are less than 23 mm wide.

Gridfinity size format is 1x4x5.