Organize sockets for quick identification by size and style. Markings on each post. Red tray holds 28 SAE sockets; gray tray holds 28 metric sockets. Fits 4in. tool drawer.Drive: 1/2 in.Pieces: 1 SAE Tray (Red), 1 Metric Tray (Gray) qty.Socket Capacity : 28 SAE (14 Deep Well, 14 Standard) 34 Metric (17 Deep Well, 17 Standard)qty.Socket Size Limit: 3/8 in. through 1 1/4 in., 10mm through 27mm.Material Type: Plastic.Standard Compatibility :Yes.Deep Well Compatibility :Yes.