Set contains eleven (11) 8 point standard length sizes 1/2" to 1-1/8". These sockets are commonly referred to as double-square or railroad sockets.
Features: 

• Modeled case with handle allows easy storage and convenience while working
• Sockets are made from high quality alloy (chrome-molybdenum)
• Heat treated to provide the correct balance of strength and durability
• Impact socket's "high torque" drive provides increased strength through the transfer of pressure from the thinnest part of the socket wall toward the thicker section
• Feature 20 percent more torque than on standard hex impact sockets
• Increase to tight areas through pressure shift to reduce the socket wall thickness
• Reduced wear and chance of rounding off fasteners by the grip the sockets provide on the fastener across a broader contact area