Concrete vibrators remove air pockets from newly poured concrete to ensure that it consolidates and reaches its maximum finished strength. They prevent honeycombing (bug holes) and properly pack the aggregate to increase density and reduce rework and surface patching. Also known as immersion vibrators, their rod-shaped head inserts into wet concrete and pulsates to force air bubbles up and out at the surface. They emit a radius of vibration that is four times the head width to vibrate concrete in sections. Corded concrete vibrators allow long run times for repetitive tasks, maintain full power during operation, and have no batteries to recharge. Cordless concrete vibrators operate in areas without access to wired power, eliminate the tripping hazard of a cord, and run on brand-specific batteries.