Wrench Sorting & Storage Tray Molded of durable polypropolene Accomodates 10mm-7/16" wrenches 6.5 inches long and 19mm-3/4" wrenches 0.25 inches long. A combination label is supplied so you can store either metric or SAE wrenches. To sort a wrench, slide the open end over the sizing bar until it stops Organized by size and stored on edge (instead of flat).