Features: There are 7 types, 4 Pcs/5 Pcs/Single 3/4/ Single 1/4/Single 3/8/Single 3/8/ Single 1/2, pick based on your needs. Size: 1/4 to 3/8, 1/2 to 3/8, 3/4 to 1/2 ,3/8 to 1/2, 3/8 to 1/4. Designed specifically for impact drivers & wrenches. Made of chrome vanadium steel for superior strength, surface with phosphating treatment. Spring loaded detent balls keep your sockets secure and through holes allow the use of locking pins & rings. Package Includes: 4/5x Impact Socket Adapter Or Single Impact Socket Adapter Specifications: Material: Cr-V Size: 1/4, 3/8, 1/2, 3/4, 3/8 note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.