The Swingline Three-Hole Punch SWI74350 features durable all-metal construction and exceptional flexibility, making it a reliable long-term performer. It is equipped with high-quality, sharp cutting punch heads that create clean 9/32 holes. This heavy-duty punch can accommodate up to 32 sheets of 20 lb. paper and offers adjustable centers for diverse punching applications. The margin adjusts to 3/8", and the paper guide can be set for both letter-size and legal-size documents.