... 1.material:mild steel,45# steel,40Cr 2.surface:zinc plated,black oxide.... 3.size:M8-M42 4.grade:4. ... 8,8.8,10.9 yellow zinc plated hex nut, unc hex nut, hex nut grade 8 ... 1.material:mild steel,45# steel,40Cr steel2.surface:zinc plated, black oxided,phosphated3.size:M8-M424.grade:8.8, ... hex nuts as per your drawing and/samples.We can supply package by your design.Other services can be consulted ...