The Flexi-Coil 5500 air drill features a patented two-piece wing, with simple, parallel-circuit hydraulics, to minimize stress on the framework while ensuring depth accuracy. The air drill is available in 60 ft (18.3 m) at 7.5 in (191 mm), 10 in (254 mm) and 12 in (305 mm); while the 70 ft (21.3 m) is available at 10 in (254 mm) and 12 in (305 ...