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A staple is a type of two-pronged fastener, usually metal, used for joining or binding materials together.
Large staples might be used with a hammer or staple gun for masonry, roofing, corrugated boxes and other heavy-duty uses.
Saddle stitch staplers, also known as "booklet staplers," feature a longer reach from the pivot point than general-purpose staplers and are used to bind pages into a booklet or "signature".
Some, such as the Ring King, can also use "loop-staples" that enable the user to integrate folded matter into ring books and binders. there is no anvil, and they are applied with a staple gun.
Some staple sizes are used more commonly than others, depending on the application required.
The large staples found on corrugated cardboard boxes have folded legs, but they are applied from the outside and do not use an anvil; jaw-like appendages push through the cardboard alongside the legs and bend them from the outside.
Some staple guns use arched staples for fastening small cables, e.g. Devices known as hammer tackers or staple hammers operate without complex mechanics as a simple head loaded with a strip of staples drives them directly; this method requires a measure of skill.
Powered electric staplers or pneumatic staplers drive staples easily and accurately; they are the simplest manner of applying staples, but are hindered by a cord or hose.
Cordless electric staplers use a battery, typically rechargeable and sometimes replaceable.
The term "stapling" is used for both fastening with straight or bent legs; however, when differentiating between the two, the term "tacking" is used for straight-leg stapling, while the term "stapling" is used for bent-leg stapling when being contrasted with "tacking".
There are also speedpoint staples, which have slightly sharper teeth so they can go through paper more easily.