Skull Hooks Brass S Hooks Lot of 2 Copper Alloy Cupronickel Silver Tone Skulls Hook Retro DIY Crafts These two sided silver tone cupronickel (copper nickel alloy) skull s hooks are compact, solid and will not rust or corrode. They measure 3 cm x 1 1/2 cm (1.18 x.59) inches. The opening in the hook is about 3.5 mm. See the pics for the relative size or the brass color version of these hooks. Listing is for two hooks. They ship free, new and sealed in a velvet jewelry pouch. See our other items for more skulls and dark themed metal.