Tough polypropylene racks hold 13 wrenches firmly with its gripping system and comes with two sets of peel-off numbers: One in Metric sizes 6mm through 20mm and the other in SAE sizes 1/8″ through 1″.; Wrench racks can be customized by combining Metric and SAE sizes.; Spring tabs can also be trimmed to custom fit extra thick wrenches.; Shows at a glance when a wrench is missing and offers instant selection of the right size wrench.; Size: 6 1/4″ x 1 3/8″ x 12 3/4″