1、Self-expanding cushion is easy to install and designed to hug sleeves for a tight grip, keeping sanding paper in place for an extra fine finish 2、Standard size drums are common and compatible to use with rotary tools such as drill presses and hand power drills 3、It comes with strong storage case for quick access and protection 4、Quality construction built is long lasting, lightweight and durable for sanding holes, contouring edges, and buffing out irregular shapes 5、Ideal accessory for home improvement, hobbies, DIY, carpentry, wood working, and many more Features: Self-expanding cushion is easy to install and designed to hug sleeves for a tight grip, keeping sanding paper in place for an extra fine finish. Standard size drums are common and compatible to use with rotary tools such as drill presses and hand power drills. It comes with strong storage case for quick access and protection. Quality construction built is long lasting, lightweight and durable for sanding holes, contouring edges, and buffing out irregular shapes. Ideal accessory for home improvement, hobbies, DIY, carpentry, wood working, and many more. Specifications: Quantity: 25pcs Weight: Approx. 923g 5pcs Rubber Drum Sizes Diameter Height Shank Diameter 1/2inch 1/2inch / 12.7mm 3mm / 0.12inch 3/4inch 1inch / 25.4mm 6mm / 0.24inch 1inch 1inch / 25.4mm 6mm / 0.24inch 1-1/2inch 1-1/2inch / 38.1mm 6mm / 0.24inch 2inch 1-1/2inch / 38.1mm 6mm / 0.24inch Package Included: 5 x Rubber Drum 2sets(10pcs) x Fine Sleeves (120 grit) 2sets(10pcs) x Coarse Sleeves (80 grit) 1 x Case Note: Only rubber drums, sanding sleeves and case, no other stuff included.