double threaded bolts 1.M5-M100 2.threaded rod material,ss304,ss316,40Cr,etc ... 3.SGS,ISO 4.black,zinc plated,HDG,etc double ... Non-standard Diameter: M6-M39,1/4-1 1/2 Length: 30MM-3000MM,1"-12' Packing: Standard export ... 30 days after order is confired2.double threaded bolts Dimensions Product name double threaded bolts Specification M2-50MaterialMild/medium/ ...