Spirals are used for attaching chain to side of sash. Spiral fits in knothole for old sash cord. Wind spiral through chain and secure in side of sash with a screw.
Spirals are 3/4" or 7/8" diameter.
Hooks are used for attaching chain to antique weights. Make a noose with the hook to attach to eye of antique weight.
Our modern weights are secured with #33 7/8" spirals.