This item is a set 7-piece impact socket adapter. These tools adapt to the situation on the fly to get it done. They create replacements for lost or broken sockets, expand incomplete socket sets, and allows greater flexibility for all sockets and drive tools. Features - Color: Black. - Material: Chrome-vanadium steel. - Size: 7.10X1.10X1.10cm/2.79X0.43X0.43 inch. - This impact socket adapter is perfect for air tools, hand tools, . - Impact sockets efficiently transfer torque from impact wrench to fastener, loosening the most stubborn nuts and bolts. - Made of high strength steel. Whole quenching heat treatment, durable high hardness. - Specific impact grade socket adapter made exclusively for power drivers and wrenches, spring-loaded detent ball can firmly lock the adapter into socket avoiding dropping in high-speeds rotation, safely and steadily. - Detent ball on each adapter end provides a secure fit into the socket, providing support when used with high torque impact drivers. Package list: 4 x sockets 3 x connecting rods