Tray and lid made of high density polyethylene. Will not rust or corrode. Acids, harsh chemicals and oils will not harm. Glue will not stick to them. Will withstand temperature from 250°F to minus 40°F. Reinforced handle. Snap on lid to keep parts and tools clean and dry. Six removable dividers for compartment preference. Sits on 2″ x 4″, 2″ x 6″ etc. Made in North America.