DescriptionNeodymium magnets for science, innovation, engineering, and industry. Super strong Rare Earth magnets once they get stuck with each other, they are hard to break apart. Those magnets have hole in the center of them, you could use screw to fix them on non-magnetic surface such as brick wall, wood or plastic. Great for Model making, theatre design, furniture making, exhibition displays, packaging, fridge magnet, sign or note, picture holder, tools hanger, artworks and handcraft DIY,ect.Feature- Color: As shown - Material: magnet - Size: 3.6 x 3.6 x 0.7cm - Countersunk Hole: 6.5mm 12mm - Permanent, super strong Rare-Earth magnets hard to break apart - An countersunk hole for fixing - They are magnetized through the thickness. - You can use screw to fix them on non-magnetic surface such as brick wall, wood or plastic. - Great for Model making, theatre design, furniture making, exhibition displays, packaging, fridge magnet, sign or note, picture holder, tools hanger, artworks and handcraft DIY,ect.