pitch 3:1 for 3/16" - 9/16" (5.5 - 14.3 mm) punches up to 25 sheets* per cycle binds up to 135 sheets* (12 mm) variable paper sizes up to 14.2" (36 cm) variable margin depth 42 selectable punch pins integrated binding table book thickness gauge wire size gauge wire holder easy-adjust closer heavy-gauge metal construction for outstanding durability. A gear driven punch with a long punching handle for maximum punching power with minimum effort.