【Industrial Grade Ferrite Ring Magnet】Manufactured according to ISO 9001 Quality Standards. High-quality materials determine the quality of magnets. Outer Diameter 70mm(2.75"), Inner Diameter 32mm(1.26"), Thickness 15mm(0.59"). 【Durability】Grade 10 ring magnet provide reliable and stable magnetic strength for heavy-duty holding. These large magnet ring offer strong adhesion to metal surfaces while maintaining long-term durability and consistent performance. 【Wide Application】These large heavy-duty ring magnets are widely used in garage, warehouse, office and home for tool organization, item holding, sealing and storage. They also work great for school science projects, crafts and daily fixing applications. 【Excellent Performance】Made of high-grade ferrite ceramic material, these round magnets with hole feature excellent resistance to demagnetization, corrosion and oxidation. They do not rust or require coating, ensuring long service life and reliable use in various conditions. 【Professional Brand】We specialize in magnets with a full range of sizes available. For other dimensions, please search AOAUTO Magnets. Ferrite Ring Magnet,2.75In Dia, Heavy Duty Round Ceramic Disc Magnets with Hole for DIY Crafts Science Projects Industrial, Pack of 2,donut magnet Grade 10 Ferrite Ring Magnet,2.75In Dia, Big Magnets Heavy Duty Round Ceramic Disc Magnets with Hole for DIY Crafts Science Projects Industrial, Pack of 2