The New Irwin #1 Square Insert Bits #1 x 3512032C are high-quality drill bits from the trusted brand Irwin. These bits are designed for precision and efficiency, with a square insert for easy bit changes and improved fit. The #1 size ensures a snug grip on the chuck, while the durable construction guarantees long-lasting performance. Perfect for various drilling applications in the home or workshop, these bits are a valuable addition to any tool collection.