The square pin safety pin square lock pin spring pin is designed for maximum security and durability. suitable for use with trailer hitches, this pin features a spring-loaded locking mechanism that ensures a tight and secure fit. To use, insert the pin through the hitch and receiver, then engage the spring latch to lock place. This prevents any unwanted movement or detachment, making your towing experience safer. Features -Color:Silver -Material:Carbon steel -Size:7.80X5.00X1.20cm/3.07X1.97X0.47in -Nominal diameter: 10 mm -Durability: these trailer hitch are designed for durability and resistance to tear and wear -Wide range uses: these are suitable for securing and connecting trailer hitches, couplers, and other components, offering great versatility -Safety pin: the dshaped safety pin design ensures a firm and secure connection, preventing accidental disconnection -Square locking pin: the unique square design offers enhanced locking performance, keeping the pin securely in place -Spring loaded mechanism: the integrated spring provides extra tension, ensuring the pin remains tight and does not loosen over time Package list: 2 x Spring