2012 SANDVIK DD321-40, Sandvik DD321-40 Jumbo Drill 2 Boom. Serial # 112D22742. 2012 Year of Manufacturer. TFX 6;/12‘Telescopic Feeds. Sandvik RD520 Drills. Boom (1) Hours 2513. Boom (2) Hours 2544. CE Label. Mercedes 904 Engine. Engine Hours 1650.