For Insert Socket Set Shockwave Impact Socket Adapter Set, 2 sets per pack. Driver Adapter Dimensions: 1/4 Inch, 3/8 Inch, 1/2 Inch. Made by precision machining of chromium vanadium alloy steel with special heat treatment. Each square has a spring-loaded ball bearing section that securely holds the socket and prevents sliding. Performance-optimized and heat-treated S2 steel provides greater flexibility and durability compared to standard, brittle bits. Color: As Shown Material: Alloy Steel Package Contents: 2 sets * Driver Socket Adapter Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowance is +/- 1-3 cm.