Cordless rebar tying tools loop, cut, and twist tie wire, wrapping it around intersections of reinforcing bars to prevent shifting when concrete is poured. They work faster and produce more uniform ties than manual tying. Also known as rebar tie guns, they hold a compatible spool of tie wire, feed the wire to the mouth of the tool, and apply the wire to the rebar. These cordless rebar tiers run on brand-specific batteries.