They are uniquely designed with a designated hook slot for further securing your soft plastic worm while positioning your hook
perpendicular to the worm for better hook-up ratios.
Finesse ID - 5mm (Fits small sized finesse worms)
Medium ID - 8mm (Fits 4 and 5 inch Senkos)
Magnum ID - 9.5mm (Fits 6 and 7 inch Senkos)