Type YT23D air legged rock drill Weight 24kg Overall length 668 mm Operating air pressure 0.35-0.63 *** I***ct frequency ¡Ý28HZ Air-pipe bore(inner Dia.) 19 mm Water-pipe bore(inner Dia.) 13 mm Air consumption ¡Ü38L/s Drill rod trailer(the sides length of the hexagon) 22 x 108 ? mm Drill bit ?4-42 mm Type FT160A one-way air leg Leg length 3006mm Propulsion stroke 1338 mm Weight 17kg Type FT160B one-way air leg Leg length 2526mm Propulsion stroke 1098mm Weight 16kg