types of nuts bolts: 1Materials:Carbon steel 2Size:M20*40, ... :ISO9001:2008,SGS Fasteners grade8.8 hex head types of nuts bolts Details of the product:1Materials: Carbon steel 2Size: M20*40 ... ASTM,GB,etc. 4Grade: 8.85Surface: Darconment (Black, HDG, Zinc plated, Dacron etc.)6Proven technique & good quality.7Packaging: wooden box8We ... your visit! Fasteners grade8.8 special hex head types of nuts bolts