Schaefer's 76-46 reefing/Cunningham hook is made from formed 316 Stainless Steel with high strength welded eyes and long stems for secure insertion into sail grommet. For most boats up to 45' (13.7 m), Rod Boat Size 5/16" (8 mm), Eye Dia. 5/8" (16 mm), Dia. 3-7/8" (98 mm), Width 2-1/2" (64 mm), Weight 3 oz. (85 g)