Material: 304 stainless steel Size: M1.5, M2, M2.5, M3, M4 Package includes: 6pcs M1.5x25mm, 6pcs M2x30mm, 6pcs M2.5x40mm, 6pcs M3x60mm, 6pcs M4x 80mm. Applications: widely used in tractors, agricultural and gardening equipment and other hitch pin locking systems.