✔ To use these sanding bands, simply place them onto a metal Mandrel bit (3.1 mm), which can be purchased separately ✔ Function: Perfect for buffing the nail plate with precision ✔ Extra use: Can also be used for the gentle removal of a thin layer of soft gel polish ✔ Quality: Secure fit, durable, and ensures smooth results without overfiling the natural nail ✔ Suitable for: Professional manicure & pedicure services