1.material:steel 2.screw thread:M6/M8/M10 3.Widths across flats:m10 /m12 / ... methodcnc Turning, Milling, Drilling, threading, stampling, punching etc..Surface finishPolishing, and Chrome plating, zinc plating, blackening, Nickel plating, ElectrophoresisColorMetal colors availableOEM ...