Hook application Posted by admin on 7 December 2018 HOOK APPLICATION THE PROCESS IS CARRIED OUT MANUALLY; THE HOOK IS FASTENED TO THE UPPER WITH BOTH A RIVET AND A WASHER FOR ENHANCED TENSILE STRENGTH. HOOK APPLICATION THE PROCESS IS CARRIED OUT MANUALLY; THE HOOK IS FASTENED TO THE UPPER WITH BOTH A RIVET AND A WASHER FOR ENHANCED TENSILE STRENGTH.