This 20-piece sanding drum set is a compact tool accessory designed for rotary tool work, and it comes packed in a gray storage case with a carry handle and secure Latch for easy organization. With four rubber drums and sixteen sleeves, the cylinder set gives you multiple options in one place, so the right drum is ready when a task calls for it.Built as a rotary sanding drum kit for drill presses and hand rotary tools, it is suited to everyday workshop jobs such as sanding, trimming edges, shaping, and smoothing irregular areas. The expanding rubber drum construction helps keep the in sleeve position during use, which supports more controlled touch when working on curved or uneven areas. The case label shows four drum sizes—1/2 inch, 3/4 inch, 1 inch, and 1-1/2 inch—each 64 mm tall, with printed shank diameters of 3 mm for the smallest drum and 6 mm for the other three. The sleeves are shown in 80-grit and 120-grit options, making it easy to move from faster removal to fine finishing as needed.