LLNDEI 1/2 inch Drive Deep Impact 37-Piece 1/2 Socket Set SAE & Metric. 1/2 SOCKET SET INCLUDES? 14x SAE Deep Sockets: 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1, 1-1/16, 1-1/8, 1-1/4″; 14x Metric Deep Sockets: 8, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24mm; 2x 1/2″ Spark Plug Socket Set: 16, 21mm; 3x Extension Bars: 3, 5, 10; 2x Adaptor: 3/8F1/2M, 1/2F3/8M; 1x CR-MO 1/2 in Universal Joint;1x Bit Holder. HEAVY-DUTY MATERIAL? LLNDEI 1/2 impact socket set is made of high-impact drop-forged construction of premium chrome vanadium steel and is treated with black phosphate to resist wear, ensuring enhanced durability. Note: The oil on the surface of the sockets is applied to prevent rusting. 6 POINT SOCKETS? LLNDEI socket set 1/2 drive features a recessed hexagonal nut that securely grips stubborn fasteners without slipping, prevents rounding and deformation under high torque. EASY TO RECOGNIZE? LLNDEI 1/2-inch socket set features permanent high-contrast size markings, ensuring easy readability in low-light conditions and enhancing efficiency and accuracy in various workspaces. And we will work with you to resolve it to your satisfaction.