1. It is made of 304 stainless steel, rust-proof and corrosion-resistant, durable, not easy to break, and can be used for a long time in humid and various corrosive environments. 2. The cotter pin with hairpin design can quickly and safely fix bolts and pins. 3. Flat and firm: the surface is flat and smooth without burrs, high-quality workmanship, strong and durable stainless steel material. 4. Scope of application: suitable for maintenance and fixing of automobiles, machinery, garages, workshops, power equipment, automobiles, trucks, lawn mowers, small engines, etc. 5. Installation position: After tightening the nut, insert the split pin into the nut slot and bolt tail hole. 6. Material: 304 stainless steel 7. Specifications: M1.5 x 25 (d: 1.5mm, L: 25mm) M2.5 x 25 (d: 2.5mm, L: 25mm) M2.5 x 40 (d: 2.5mm, L: 40mm) M3 x 30 (d: 3mm, L: 30mm) M3 x 40 (d: 3mm, L: 40mm) M4 x 60 (d: 4mm, L: 60mm) 8. Product composition: M1.5 x 25 x 100 PCS M2.5 x 25 x 80 PCS M2.5 x 40 x 60 PCS M3 x 30 x 40 PCS M3 x 40 x 30 PCS M4 x 60 x 30 PCS