5120-01-018-8956

Set consists of (9) 4″ L hex key blades: 1/20″, 1/16″, 5/64″, 3/32″, 7/64″, 1/8″, 9/64″, 5/32″ and 3/16″. Comes with a regular handle and 4″ extension. Furnished in a case. This screwdriver type hex key (Allen) wrench tightens and loosens fasteners with