Features and Benefits: * An organized system for storing wrenches - standard or metric * Patented gripping system holds your wrenches firmly * Shows at a glance when a wrench is missing * Offers instant selection of the right size wrench * Made of flexible and durable Polypropylene Plastic Includes Peel off numbers for SAE and Metric. Label tray to fit your needs. Numbers range from 6mm to 20mm or 1/8" to 1" SAE.