Construction staples are commonly larger, have a more varied
use, and are delivered by a staple gun or hammer tacker. Staple guns do not
have backing anvils and are exclusively used for tacking (with the exception of
outward-clinch staplers used for fastening duct insulation). They typically
have staples made from thicker metal. Some staple guns use arched staples for
fastening small cables, e.g. phone or cable TV, without damaging the cable.
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.