RIDGID introduces the 15 Amp THRUCOOL 7-1/4 in. Worm Drive Circular Saw. The RIDGID THRUCOOL 7-1/4 in. Worm Drive Saw has upgraded to a THRUCOOL motor to optimize performance. THRUCOOL Motor Technology allows air to flow through the center of the motor and out the sides for more efficient cooling. This saw uses top of the line technology to improve speed and performance while also keeping the saw lightweight and compact. This tool is backed by the Lifetime Service Agreement providing FREE Parts, FREE Service, For LIFE. The THRUCOOL 7-1/4 in. Worm Drive Circular Saw includes the 7-1/4 in. blade, hex key, and an operator's manual.