1. Each post is clearly marked for socket size 2. Organize your sockets for quick, easy identification by size and style 3. Post bases beefed-up to hold sockets more securely 4. Each tray holds Shallow and Deep Sockets all in one holder 5. Made of tough ABS plastic that resists oil & grease 6. Fits most U.S. and foreign made sockets 7. 100% Made in the USA 8. Tray holds 28 Sockets Total 9. Holds the Following Sockets: 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm & 15mm