[Head type]
1. flat head
2. countersunk head
3. small countersunk head
[Column type]
1. park rod type
2. groove
3. hexagonal (semi-hexagonal)
[Stainless steel small countersunk head insert nuts Column type]
Carbon steel, aluminum, stainless steel etc.
[Product specifications]
1. M3, M4,M M5, M6, M8, M10, M12
2. 6-32, 8-32, 10-32, 1/4-20, 5/16-18, 3/8-16, 1/2-13
