CARRIAGE BOLTS/ROUND HEAD SQUARE NECK BOLTS Standard:DIN603,SAEJ429 Diameter: M5--20;1/4" ---3/4" Length:15MM--300MM :1/2" ---12" Grade:Metric: Grade 4.8/6.8/8.8; Inch :Grade 2/ 5 Surface Finished: Plain,Black,Blue /White /Yellow Zinc Plated, HDG