All cotter pins are made of 304 stainless steel, rust and corrosion resistant, durable and stable, not easy to break. Package Contents: 35 pieces 1.0 x 17 mm, 20 pieces 1.2 x 21 mm, 15 pieces 1.5 x 28 mm, 10 pieces 1.8 x 37 mm, 10 pieces 2.0 x 40 mm, 10 pieces 2.5 x 45mm. FEATURESR-type design can quickly and securely fasten bolts and pins, so your work will never shrink. These heavy duty cotter pins are sturdy and reasonable in structure, very convenient to use. EASY TO CARRYOur cotter pins come with a plastic box, all the cotter pins can be stored in it. Each cotter pin size has a small compartment to ensure that different types of cotter pins will not mix together, which is convenient to install and store. APPLICATION cotter pins will firmly hold bolts in place, suitable for tractors, agricultural equipment, trucks, cars, motor homes, lawn mowers, lawn and garden equipment, workshops, electrical equipment, etc.