13 Sizes, 390 Pieces: The slotted spring pin kit includes: M1.5*6, M2*18, M2.5*10, M2.5*18, M3*6, M3*12, M3*18, M4*8, M4*10, M4*14, M4*20, M5*30 and M6*30mm. The actual size and quantity are sufficient to meet your various needs. Sturdy and Durable: Made of high-strength manganese steel, these spring pins offer high hardness and a stable black oxide finish that resists corrosion, providing a beautiful appearance and good durability. Wide Application: These slotted spring pins are widely used in automobiles, machinery, garages, workshops, and electrical equipment for positioning, connecting, and fastening parts. Portable: Equipped with a plastic box, you can organize these spring pins, making them more convenient to carry and transport, and allowing you to quickly and easily find what you need. Perfect Fasteners: The exquisite craftsmanship of the slotted pin kit will give you an excellent experience, smooth and burr-free, the best choice for fastening applications.