All metal made, argentate shell with black aluminum base, punching
and binding handle; Adjustable margin setting provides margin depth option from 3-9mm; Adjustable all of 35pcs pull-push pins; Large plastic wastepaper box; Paper setting on the base limits exact punching position Two options for hang twin wire; Holes number: 35pcs, 4x4mm Available for full size 3:1 twin wire from 3/16?-9/16?; Available for paper size: A4 or more; Maximum 25 sheets (70-80g) per manual punch with easy operation; Maximum manual binding capacity: 120 sheets (70-80g) . Best assistant of your work!