1) Type: Stanard,Hex,Flange,Step,Tap,Square,Slotted,Round,Pin,Special
2) Material: Low/Medium Carbon Steel,Stainless Steel
3) Dimension: Standard or according to customer’s requirement.
4)Grade:From 4.8 to 12.9
5) Coating: Zinc,Nickel,Plain and so on
Standard:GB,DIN,ANSI/ASME,BS,JIS,Non-Standard