... 3) Stainless steel, carbon steel. 1) Description:channel spring nuts , spring channel nuts , channel nuts , strut nuts .Spring type: Long Spring, Regular Spring, Sharp Spring, Short Spring, Top Spring, None Spring.-2 ... as C1035, C1045, etc, And with hardened treatment.-material: carbon steel, stainless steel, SS304, SS316. etc.-3) Surface treatment:plain/self colour, zinc ...