UMI frame notch kit boosts axle clearance for lowered trucks, no bed rail cutsUMI's bolt in frame notch kit enhances axle clearance for lowered trucks, essential for drops over 6 inches. The kit features robust 3 16' laser cut steel, top quality hardware, and poly bump stops. While factory frame notching is necessary, UMI's design eliminates the need to cut the valuable bed reinforcement rails. The exclusive inner support plate serves as a convenient template, and a gloss black powder coat finish protects your investment.