The package includes: 2 sanding machine drive belts with 80 teeth Replacement model: 1347220 491937-00 For Delta 31-460 Type 2, 31-460 Type 3, SA446 Type 1, SM500 Type 2. For Black&Decker BDSA100 Type 1, FS500SA Type 1 The dimensions are 12 inches (length) x 12 inches (width) x 1 inch (height). This standard size has been precisely measured to provide you with a reliable installation experience, ensuring smooth and efficient transmission, as well as easy assembly and disassembly.Made of high-quality wear-resistant material, it features high strength and tensile resistance. It can effectively transmit power, reduce slipping, ensure the continuous and stable operation of your sander, and improve the efficiency of sanding operations The design is reasonable, and the installation process is simple and quick. You can replace the old or damaged drive belt yourself without requiring professional tools or complicated steps, allowing your sanding machine to quickly resume operation, saving time and effort.