Akiles WireMac-31 Model AWM31 Wire Punch & Binding Equipment, 3:1 Pitch, All 40 Disengaging Dies, Square (0.157&Prime; x 0.157&Prime;) Hole Punch, Heavy-Duty, 20 sheets single punching capacity (20 lbs paper) 20 sheets single punching capacity (20 lbs paper) 14 width punching capacity with open sides for even wider documents All dies can be independently disengaged, to allow the punching of any size document while preventing partial side-end perforation Closing capacity: From 3/16 to 9/16 All metal construction