The Dive Rite Wing Retainer Hook is used in combination with SKU: DIV2815 Wing Retainer Loop on previous style Rec -EXP Wing.This style was changed to use gusset control bungee system at the beginning of 2013. The hook /loop system were used to retain the wing when being used for single tank diving to prevent the taco-effect. Each wing used 4 hooks (2 to attach to the loop on the waist webbing, and 2 to attach to the harness or platejust below the diver's shoulders). These hooks attached to the wing via a 1" (2.5cm) sewn-in rectangular loop on the wing. The plastic retainer hooks measures 2 x 1" (5 x 2.5cm) and weigh 0 .2 oz (5.7g).