u bolt and nuts Diameter: 10-30mm. Thread pitch: 105mm, 1.75mm, 2.0mm, 3.0mm Material: mild steel, 1035steel, 1045steel, 5140steel Shape: round, half-round, square, flat round, flat half-round, flat square Finishing: Bake paint, Black Oxide, Zinc Plated, Phosphate, Electrophoresis, , Dacromet etc