... : 1,2,3,4,5,6,8,10,12 LB non-sparking safety tool copper hammerThey are mainly used in hazardous environment ... ,railroad,and mining ects. They can avoid to rise sparking when tools strike,rub or collide with target in explosive atmosphere.There ... =1.35KG4LB=1.80KG6LB=2.7KG8LB=3.6KG10LB=4.5KG non-sparking hammer, copper hammer