Material Carbon Steel Item No. Iron Stone Origin Origin China
Brand Day and Diameter Standard Specifications Product Specifications 4,6,1,1.2,1.5,2,2.5,3,4
4 points 
6 points 
1 inch 
1.2 inch 
1.5 inch 
2 inch 
2.5 inch 
3 inch 
4 inch 
4 points GB 
6 points GB 
1 inch national standard 
1.2 inch national standard 
1.5 inch national standard 
2 inch national standard 
2.5 inch national standard 
4 inch national standard