Super strong. Use to hold or hang heavy objects throughout your classroom. Made with super strong neodymium magnets. Hooks can swivel up and down. Holds 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. 1" diameter, 2-1/2" long hook. Includes 2 hooks per package.