Application: The trampoline screws are compatible with many different trampoline brands. The installation of long screws on the trampoline can make the trampoline more stable and not easy to shake.Be sure to measure the length of old screws before purchasing trampoline screws (Refer to Figure 2).Bolt Length 3",Nut Height 0.2" ,Black Gap Spacer Height 0.3",Available Bolt Length 2.5". Package Includes: 12 x Trampoline Screws, 1 x open wrench. Important note, Nylon lock nuts are used in our trampoline screws kits, and Nylon Lock Nuts Use the matching wrench to tool to screw in. Nylon Insert Lock Nuts are also known as stop nuts. Lock nuts are used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material are located at the top of the nut. The purpose of the nylon insert is to prevent backing off or loosening from vibration. Compared with the bolt heads of other brands of trampoline screws, the square shoulder underneath the rounded head is unique because this design can resist rotation when the nut is removed or tightened. Wide Range Of Uses:The 12-piece bolt and nut set can be widely used in trampolines, cribs, bunk beds, chairs, cabinets, workbenches and other furniture; it can also be well connected to wood, headboards and cabinets.