B47 jack hammer,or called pneumatic breaker,can break ferroconcrete,rocks,asphalt or any frozen objects in ... minie,roads,bridges. B47 Pneumatic Breaker1.Instruction:B47 pneumatic breaker belongs to a kind of pneumatic instrument combined with the ... ’s featured with portability, durability, high efficiency and speedy, the breaker machine can break ferroconcrete, rocks and asphalt. Its an ideal ...