Check the listing for details. 4Pcs J Hook Crossover Tool Box Mounting Clamps with Fastening Nuts, Silver. Condition: New. Listed at 23.03 USD. What You Get: The J-hook truck tool kit includes 4 J-clip rail clamps and 4 nuts. The clamp height is 28mm/1.1", the total screw length is 95mm/3.74", and the washer diameter is 30mm/1.18".Application: The truck bed clamps are suitable for most standard truck beds. The J-clip rail retainer is combined with washers and lock nuts, and whether it's camping gear, tool transportation, or outdoor work, it ensures the toolbox remains securely fastened even on rough and uneven terrain.Installation: The installation process is simple and quick. Just snap the J clamp into the bottom rail of the tool box, align the reserved holes of the vehicle cargo box, insert the screws and put on the washers, and finally tighten them with the matching nuts.