Super strong! Use to hold or hang heavy objects throughout your classroom. Made with super strong neodymium magnets. Hooks can swivel up and down. Hooks can hold approximately 20 lbs. from a vertical position and approximately 10 lbs. from a horizontal position on heavy steel. Holds approximately 1 lb. on a whiteboard and approximately 8 lbs. on a metal door. Details: Silver1" diameter2.5" long hook2 packs (2 hooks per pack, 4 hooks total)Magnetic