DIY enthusiasts and crafters, these rubber mandrels are seriously handy for all your sanding and polishing projects! You get 12 pieces in the pack, which is perfect for having replacements on hand or using different grits without constantly changing drums. The 12.7mm (1/2 inch) diameter fits standard sanding drums perfectly, while the 3.175mm (1/8 inch) rod diameter works with most rotary tools. The rubber material provides excellent grip so your sanding drums won't slip during use, which is crucial for getting smooth, consistent results. These are perfect for smoothing curved edges, polishing both soft and hard materials, and reaching into tight spaces where regular sanding tools can't go. Great for woodworking projects, metal polishing, jewelry making, home improvement tasks, or any situation where you need controlled, detailed sanding. The quality feels solid - these aren't those cheap mandrels that wear out quickly or don't hold drums securely. Whether you're a professional craftsman or a weekend DIYer, having a good supply of reliable mandrels makes your work so much easier and more precise. The non-slip feature is particularly helpful when working at higher speeds or applying more pressure. If you do a lot of work with your rotary tool, these mandrels are one of those basic supplies that you'll be glad to have in your toolkit. Much better than struggling with worn-out or poorly fitting mandrels that compromise your work quality.