This 25 piece set of abrasives is perfect for your metalworking needs. The 1/2" x 1" x 1/4" straight cartridge roll with 100 grit A/O is designed for efficient and effective sanding. The brand, Standard Abrasives, is known for its high-quality products that meet the needs of professionals. The roll diameter is 1/2" and the roll length is 1". This cartridge roll is suitable for use in a variety of metalworking applications. The abrasives are made from materials that are durable and long-lasting. This set is a great addition to your metalworking supplies collection.