This punching die features 3:1 pitch, 4mm round holes for Wire-O bindings. Compatible with the James Burn EX380, these punching dies are made of the highest quality features and have an industry-leading design. These heavy duty, hardened steel dies offer easy access and longer, sharper life. Set up is fast and easy for a wide variety of sizes and materials. Heavy Duty Punching Dies are available in a wide range of die patterns, including Wire-O®, Plastic Coil, Plastic Comb, VeloBind®, loose leaf styles, and more.