Professional spanners for commercial or occasional use AF / Imperial / Sae spanner set Combination spanner so one end is open and the other is a ring spanner 12pc imperial spanner set Manufactured from chrome vanadium steel for strength and durability The closed end has a 15 degree ring for access into more restricted areas as well as to take your knuckles away from the item to prevent injury Bi-hex 12 sided ring spanner for greater leverage and less chance of slipping when using SET INCLUDES THE FOLLOWING • 1/4", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" and 1" Comes in a tool roll for easy storage and transportation