PN: 20331 Williams 13213 Ball End Hex Key Set Long
The ball end advantage is that they turn 360 degrees at up to a 35 degree angle. 13 pieces (0.050, 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" & 3/8"). SAE. Made in USA.