RB777 Jack hammer is a ideal tool that break up concrete and other solid object in the road construction and installation.It has characteristic of simple structure, high efficiency and handy use . As long as fix a drill shank, turn on air source, then working. Weight 37kg Length 733mm Rammer dia 57mm Rammer stroke 189mm Air pressure 0.63Mpa Impact frequency 18.3Hz Air consumption 34L/ s Air pipe inner dia 3/ 4¡ ± Lubrication capacity 30ml