Ratcheting open end turns nuts and bolts without removing wrench from fastenerFits 6 fastener types - Hex, Square, 12 pt., E-Torx, Rounded Hex, and SplineSAE 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16"Smooth profile allows for more torque to be cmfortably applied to the fastener This listing is for Each.