Type YT27 air legged rock drill Weight 27kg Overall length 668mm Operating air pressure 0.63 *** I***ct frequency ¡Ý36.7HZ Air-pipe bore(inner Dia.) 25mm Water-pipe bore(inner Dia.) 13 mm Air consumption ¡Ü83.3L/s Drill rod trailer 22 x 108 ? mm (the sides length of the hexagon) Drill bit ?4-45 mm Type FT160A one-way air leg Leg length (max) 3006mm Propulsion stroke 1338mm Weight 17kg Type FT160B one-way air leg Leg length (max) 2526mm Propulsion stroke 1098mm Weight 16kg