Our impact socket set includes for you to provide you with the size required for the smooth ition from the socket to the socket Our impact socket adapter is made of steel, with high hardness, good toughness, strong impact resistance, and will not be after long -term use Each socket adapter has a spring roller bearing bearing, which can be locked firmly when used to prevent displacement and falling Our shock sleeve suite surface reducer surface is treated with phosphate to increase its hardness, and it is not easy to rust after long -term use The impact sleeve adapter set is designed for drivers, wrenches and spiny wheels.The wrench adapter is easy to convert, and is highly compatible with pneumatic tools, electric tools or driving tools Product name: steel impact adapter conversion joint set Colour:As Shown Material:steel Size:A:1/2inch-3/8inch + 3/8inch-1/2inch(2PCS) or B:1/2inch-3/8inch + 3/8inch-1/2inch+1/4inch-3/8inch+ 3/8inch-1/4inch(4PCS) Package Contents: 1 set x 1 1/2 socket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.