The sockets range in size from 9 to 30 mm and come in a heavy duty case for convenient storage, transport and organization. Forged out of a durable steel alloy, the Sunex 1/2-inch drive master impact socket set is ideal for applications where you need high torque. Both the hex and square drives have radius corners, which securely grip fasteners while reducing wear. This Sunex master impact socket set also includes extension attachments to make recessed fasteners easier to reach and a flex joint for use in swivel applications. The sockets range in size from 9 to 30 mm and come in a heavy duty case for convenient storage, transport and organization. Forged out of a durable steel alloy, the Sunex 1/2-inch drive master impact socket set is ideal for applications where you need high torque. Both the hex and square drives have radius corners, which securely grip fasteners while reducing wear. This Sunex master impact socket set also includes extension attachments to make recessed fasteners easier to reach and a flex joint for use in swivel applications.