Hilti's S-NSD line of impact sockets offer long-lasting durability under the most stressful applications. Used for fastening lag bolts, steel bolts, high strength steel bolts and concrete screw anchors, S-NSD impact sockets feature a 1/2 in. square drive anvil and are constructed of CrMo alloy steel for added strength, wear resistance and reliability. 3 in. long version provides extra length for fastening in hard to reach areas. Two detent holes increase connection accuracy between the socket and ½" anvil. Perfect for use on corded or cordless impact drivers.