The JA90-350IR model adapts to the commonly used 90-lb. Ingersoll Rand MX90 jackhammers/pavement breakers. Like the base model JA90-350, the IR version is specifically designed to assist operators with the lifting of a jackhammer. Actuating the JA90-350IR with every cut allows the operator more control and ease of use while running the jackhammer. The JA90-350IR version maintains the same ergonomic design of the JA90-350. The JA90-350IR Jackhammer Lift Assist reduces operator stress and fatigue.