1.Product Name: Hammer Head T Bolts Square Head Screws 2.Material: 304 A270 Stainless Steel 3.Thread Diameter: M5 (5mm), M6 (6mm), M8 (8mm), M10 (10mm), M12 (12mm) 4.Scratch Technology Each of our super strong neodymium magnets has a smooth surface, which can be easily removed without leaving scratches on your refrigerator or office board. Ideal as dry erase board magnets, push pins magnets, white board magnets, map magnets, note or photo walls, crafts, DIY materials, etc 5. Epoxy Coated Magnets The heavy duty disc magnets are made of brushed nickel silver finishing material, durable materials, more anticorrosion and antioxidation effect compared with traditional silver magnets, which makes it have a longer life 6.Unlimited Uses You can use the small crafts magnets when displaying photos, greeting cards working session papers as an aid. Also can help storage things or fixate items like charging cables, fountain pens and sticky notes. The small fridge magnets are super useful for home and office.