Sockets have FOUR FLAT 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 3/8 and 50-piece 1/4 Drive Ratchet and Socket Sets organized in the included PACKOUT 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 PACKOUT 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 PACKOUT Compact Low-Profile Organizer (48-22-8436).