Check the listing for details. 1Pc J Hook Crossover Tool Box Mounting Clamp with Fastening Nut, Black. Condition: New. Listed at 12.03 USD. What You Get: The J-hook truck tool kit includes 1 J-clip rail clamp, 1 nut, 1 washer and 1 M8x1.25 screw. The clamp size is 29x28x27mm/1.14"x1.1"x1.06", the total screw length is 95mm/3.74", and the screw head diameter is 14mm/0.55".Application: The truck bed clamp is suitable for most standard truck beds. The J-clip rail retainer is combined with washer and lock nut, 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 screw and put on the washer, and finally tighten it with the matching nut.