Sockets have FOUR FLATT Sides that deter rolling and are wrench compatible. 90-Tooth ratchet provides 4° of arc swing and a slim profile for work in tighter spaces. Keep both the SAE & Metric 56-piece? ” and 50-piece ¼” Drive Ratchet and Socket Sets organized in the included PACKOUTT Compact Low-Profile Organizer. A clear top makes for easy identification of parts at a glance. The Compact Low-Profile Organizer is part of the MILWAUKEE® PACKOUTT Modular Storage System, allowing you to custom build storage systems to easily transport and organize your tools and accessories. Includes the 56 Piece 3/8″ Set (48-22-9008), and 50 Piece 1/4″ Drive Ratchet and Socket Set (48-22-9004), with the PACKOUTT Compact Low-Profile Organizer (48-22-8436).