... . Material: 35k,q235, c1010 2. Surface: Black, ZP, HDG 3. Grade:4.8,6.8,8.8 ... and Nuts1. Material: 35k,q235, c10102. Surface: Black, ZP, HDG3. Grade: 4.8,6.8,8.84. Standards: ... .8,8.8Size:M6*16-150 M8*20-150M10*20-150M12*20-150M14*30-150M16*30-150M18*40-150M20* ... :We have been engaged in the fasteners for 20 years.GOOD SERVICE:We will respond to you ... quality nuts din934 din558 hex agon nuts zp black M6-M56