1/2 in. Drive SAE and 1/4 in. Drive Metric SHOCKWAVE Impact Duty Deep Well Socket Set (21-Piece)Have the socket you need always on hand with this 1 2 in. Drive SAE and 1 4 in. Drive Metric Impact Duty Deep Well Socket Set. Each socket is made from solid steel and heat treated for superior hardness and durability. They're designed to resist impact damage and handle your heavy duty applications. They also have thin wall construction so you can easily access tight spaces. Includes: one 1 4 in. hex to 1 2 in. square adapter, one 3 8 in. SHOCKWAVE