... .5-2.5mpa Impact frequency :25 match bit :115-254mm With yeas of experience, now Zhongrui can manufacturer the best qualith ... 340,350,360,380 4",5",6",8" quick hammer with very good price and service. No.ModelOutside diameterLength (without bit ... (at 1.7Mpa)15-34API(4 1/2)" REG195-254 newly designed air hammer