Klein Tools KNECT Flip-20 1/4-in, 3/8-in Drive Standard (SAE) Deep Socket Set (13-Pieces) Model #65239 This 20-Piece impact socket set features (10 SAE and 10 Metric) sizes combined into 10 color-coded sockets. Each impact flip socket features two coaxial spring-loaded sockets in one. Set includes Nested adapters for dual drive (1/4-Inch hex flip socket shaft nest into 3/8-Inch square drive adapter). Also comes with a Compact, modular storage system with a clear lid that is compatible with MODbox(TM) and stackable with other cases of its similar design. Multi-purpose adapter makes the sockets compatible with the Klein KNECT system for unlimited driving potential. Deep Well Impact Flip Socket Set includes 20 SAE and metric sizes combined into 10 color-coded sockets plus two nested adapters and one extended shaft. Set includes 1/4 x 5/16, 3/8 x 7/16, 1/2 x 9/16, 5/8 x 3/4, and 11/16 x 13/16 inch socket sizes and 8 x 10, 9 x 11, 12 x 14, 13 x 15, and 16 x 18mm socket sizes. Six smaller sockets sizes 1/4-Inch to 9/16-Inch ( 8 to 14mm) are stackable on 650QSAL to quickly change socket sizes and reduce the number of tools needed. Klein KNECT specialized square drive adapter compatible with Klein Tools pass through socket wrench (Model 65400) and any 3/8-Inch square drive ratchet. Small parts storage tray inside the case to secure loose fasteners, washers and extra bits. Compact, modular storage system with a clear lid is compatible with MODbox? and stackable with other cases of its similar design.