Size: 1/4 inch diameter sanding drums 320 grit small sanding sleeves, 1/2 inch length Sanding sleeves require drum mandrels to be fitted onto them. The size of the sanding sleeve should match the diameter and length of the drum. It's crucial to ensure that the sleeves are adaptable to the drum's size to achieve proper fit and performance. Available in 3 diameters (1/2, 1/4, 3/8), the small sizes for detailed sanding work. Widely used for deburring, grinding, shaping, or carving nut, wood, plastic, metal, stone, jade, ceramics, and other DIY production. Fit for drum sander or rotary grinders.