Powerbuilt Imperial Ball End Allen Key 9 Piece Set
Includes 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 1/4, 5/16, 3/8 inch. For loosening and tightening hex head screws. The ball end allows use at angles up to 25 degrees and greatly increases versatility. Heat treated, precision machined, chrome vanadium steel keys slide into an indexed plastic storage case.