engine stud bolts 1. Material: carbon steel 2. Certificate: ISO9001:2008 3. High quality with nice price engine stud bolts Specification:1. Standard or non-standard hexagon bolts2. Material: carbon steel 35#, 45#3. Surface: Blue-white, Black, etc.4. Packing: bulk, box packing, polybag www.zjga.com.cnwww.cnga.en.alibaba.com