Gauge checks tire and wheel run out; disc brake rotor run out; and ball joint wear. Flex-Arm makes positioning easy. Clamping pliers securely attach anywhere on your balancer. Gauge has a large contact for checking radial run out, and a roller contact for checking wheels and sidewalls. Six-inch extension provides added reach. Retaining ring prevents indicator from falling out. In a fitted case. Meets state requirements.This set is covered by manufacturer's warranty serviced at their factory.