• Super powerful: each magnet has a diameter of 3.17 cm and a thickness of 0.5 cm, with a holding power of up to 90 pounds. • Strong and durable: the magnets are protected inside steel cups and coated with three layers of nickel, copper, and nickel, making them rust-resistant, anti-fracture, and scratch-resistant. • Unlimited applications: ideal for DIY, crafts, scientific purposes, and use in refrigerators, doors, garages, kitchens, homes, businesses, and schools. • Quality guaranteed: manufactured under ISO 9001 quality systems, with an integrated molding design that allows them to be screwed into wood or low-hardness surfaces. • Includes: 4 neodymium magnets and 4 screws. • Instructions for use: slide a magnet from the top of the stack to separate it safely. Do not attempt to pull, lift, or pry from the stack before sliding it to the side. • Warnings: keep away from pacemakers, powerful magnets can damage fingers, not suitable for children without supervision, and dispose of completely if damaged.