Buy a KDT81917 and get a KDT81920P - KD Tools

Features and Benefits:

Long pattern length for greater access
Surface Drive Plus™ technology provides stronger grip on fasteners, reduces fastener rounding and delivers up to 25% more torque
Size stamped on both sides and head
Offset box end
Chrome vanadium
Sizes include: 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/16", 1-1/8" and 1-1/4".