... , BS, GB, JIS, Non-standardMaterial: Carbon steel, stainless steel, alloys steel.Class: 4.8,8.8,10.9,12. ... company include the following 7 types:1. High strength alloy steel double end stud- , fully-threaded stud ... guardrail panel of expressway with mechanical property of Grade 4.8 and 8.8.4. Elevator ... with mechanical property of Grade 8.8, 10.9 and 12.9.5. Stainless steel internal and external hexagon ...