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By certification 
Name: non sparking octagonal hammer
Introduction: Used for hitting,assembling machine and chiseling rock/gravel in mountaintop-removal,building road,suitable for large knocking occasions in inflammable and explosion places
Material: Be-Cu,Al-Cu,precision casting products
Specification: 450，1000，1400，1500，1800，2000，2200，2500，2700，3000，3600，4000,4500，5000，5400，6400，7200，8000，8200，9100，9900(g)
Introduction: Used for hitting,assembling machine and chiseling rock/gravel in mountaintop-removal,building road,suitable for large knocking occasions in inflammable and explosion places
Material: Be-Cu,Al-Cu,precision casting products
Specification: 450，1000，1400，1500，1800，2000，2200，2500，2700，3000，3600，4000,4500，5000，5400，6400，7200，8000，8200，9100，9900(g)
