The Westling Machine Socket Tray Organizer Set is designed to help technicians keep their toolboxes organized. The set is CNC machined from billet aluminum and anodized for durability. The set has color coded metric and standard holders and includes the following sizes: a 1/4" drive metric holder, a 1/4" drive standard holder, a 3/8" drive metric holder, two 1/2" drive metric holders and two 1/2" drive standard holders.