Commonly Use, Half or Full Thread in Precision or Semi-precision Quality Develop By Hot or Cold Forged Headfriction Grip Bolts and Screw are of High Strength for High-pressure Vessel Plants.range: Diameter M 3 to M 50 or 1/8" to 2" Length : 8mm to 1500mm or 5/16" to 5ft.phosphate: Electro Galvanized, Hot Dip Galvanizes, Blackodise or Passivity......specifications : Is, Iso, Ifi, Din, Jis & Bs.