The Mechanic's Time Savers Five-Row Lock-a-Socket Tray in matte black with green posts accommodates storage for 76 sockets in 1/4", 3/8", and 1/2" drive sizes. The interchangeable locking posts are available separately to customize the tray. The product dimensions are 21" x 9" x 2". The locking posts per size per row are as follows: 1/4" drive - one row of 20 green locking posts, 3/8" drive - two rows of 14 green locking posts, and 1/2" drive - two rows of 14 green locking posts. Rubber pegs are located underneath for surface grip and protection, and the swivel handles are included for easy carrying. These trays are made from 16 gauge powder coated steel for extra strength and durability.