Jorgensen Labs FESSA Stainless Steel Allen Wrench Type_Cage Connection therefore not causing high pressure Type_Silicon Endotube therefore not causing high pressure points in areas other than the heel High Visibility: The distinct white and orange color pattern ensures the rope is easily identifiable in complex rigging setups or low light environments Enhanced Torque Control: Provides the necessary leverage for tightening external skeletal fixation bolts to exact specifications The Jorgensen Labs FESSA Allen Wrench is a specialized instrument designed for use with the Fixation Externe de Simple et Solide Assemblage (FESSA) system