The HP A2W82A is a stapler/stacker finisher accessory rated for up to 3,000 sheets, with an optional 2-hole or 4-hole punch, designed to attach to HP's LaserJet M855 and M880 series printers. Unlike the booklet maker/finisher listed elsewhere in this catalog (which folds and saddle-stitches for booklets), a stapler/stacker collates and staples flat document sets — suited to reports and multi-page documents rather than booklets — with hole-punching for filing into ring binders. It's an add-on device only compatible with its specified HP printer series, intended for offices or print rooms that already have (or are buying) a compatible M855/M880 printer.