★Standard Fit: Perfectly fit on 1-TANK System Bucket Mops Only, the inner triangle edge measures 3.9" and the outer triangle edge measures 5.7" diameter. Not for use with 2-TANK System Bucket Mops! ! ! | ★Microfiber Performance: Our Microfiber Spin Mop Head constructed with a blend of continuous-filament microfiber and polyester for superior absorbency and release characteristics. No shredding or fraying, resulting in performance losses, as cotton and other fibers do. It can be used for dry and wet surface. | ★Machine Washable and Easy Installation : Our Microfiber Spin Mop Head is Machine washable and reusable ! This mop heads replacement easy to attach and very sturdy,please make sure that the three corners of the mop head refill are completely installed in the mop base and hear the "click" sound. | ★Multipurpose: Our microfiber spin mop head uses the power of microfiber to give your floors a deep clean.Perfet use for the smooth surface floor, such as wooden floors, ceramic tile, laminate floors, marble floors and other sealed hard floors. Also can wash the car.