surface treatment:plain,galvanized,black grade:4.8,8.8,10.9 standard:GB,DIN,UNITED STATES STANDARD Specifications:1) Color: galvanized, black, plain2) Diameter: M6 - M243) Length: 65mm - 200mm4) Grade: 4.8 grade ,8.8 grade,10.9grade5) standard:GB,DIN,UNITED STATES STANDARD5) Thread: full thread and non-full thread6)Packing: As per customers' requirements