This product is made of fine quality material, high durability, corrosion-resistant, not easy to rust. Features: High hardness, not easy to deform. Made of fine quality stainless steel material, safe and non-toxic, does not pollute the water source. Wear-resistant, rust-resistant and corrosion-resistant. High durability with stainless steel, not easy to rust. Different types of suits, a large number, can meet your use needs. Specifications: Item type: Nut Material: Stainless Steel Quantity: 5PCS Selection type: M-3, M-4, M5, M6, M-8, M-10, M12(optional) Package weight: M-3: 9.5/0.33ounces M-4: 10.5g/0.37ounces M5: 15.5g/0.54ounces M6: 27.5g/0.97ounces M-8: 37g/1.3ounces M-10: 71g/2.5ounces M12: 128g/4.51ounces Package size: 1208020mm/4.723.140.78inches Package list: 5pcs*Nuts