1.Hammer head made of steel 45, quality (210±10)g, chrome-plated surface 

2.hammer blade hardness (Shore) not less than 40HS 

3.Hammer handle made of oak, quality (70 ± 10)g

4.Hammer head center line to the vertical height of the base surface: 300mm ± 1mm 

5.The base is made of Q235 steel, size: 250mmx250mmx15mm 

6.Weight deviation: ±1g, geometric size deviation: ±1mm 

7.External dimension: 22x22x35cm 

8.Weight: 4kg