Made of high impact abs plastic so for strength and durability. Resistant to oil and grease. Trays will each display a set of short and long sockets of the appropriate drive size. Set Includes; 1/4" / 3/8" and 1/2" drive tray. Suitable for both shallow and deep sockets. Will hold; 1/4"dr Tray Shallow and deep sockets, sizes 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13,14 & 15mm. 3/8"dr Tray Shallow and deep sockets, sizes 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 & 20mm. 1/2"dr Tray Shallow and deep sockets, sizes 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 & 27mm.