Williams Mini Wrench, Open End, 5.5mm

SUPERCOMBO(R) Open End has Specially Designed Grooves That Direct Wrench Force Away from Fastener Corners, SUPERTORQUE Box Opening Design Allows Application of Higher Torque Without Rounding or Deforming Hex Fastener Points, Meets or Exceeds Aerospace Specification AS 954 for 12 Point Fasteners to Provide Accurate Torque/Tension Relationship for Precision Application, May be Used on All Common Hex (6 point) Fasteners With Considerable Advantage Over Conventional Box End Wrenches to Increase Both Hand Tool Flexibility and Economy, Box and Open End Openings are Identical