ICON Vehicle Dynamics 33100 Features:

This Bump Stop Spacer Kit is used to prevent a 3-6 inch Suspension System from over compressing. If your suspension were to over compress you could negative arc your springs causing fatigue and premature sag, as well as bottom out your shocks causing them to leak and fail. These spacers and an inexpensive way to prevent a world of expensive problems.
• 1999-2004 FORD SUPER DUTY 1.375" BUMP STOP SPACER KIT