This kit includes one 1/2" x 8" x 32" Ramp and two 45° Side Shims. These ramp kits offer a gentle, smooth transition from hard surfaces to carpet. Typically, the 8" x 32" ramps are installed in doorways of less than 48" wide and particularly in hallway doorways. The shorter transition (ramp) keeps the transition closer to the wall and out of the hallway. They eliminate waste and fit nicely in most residential doorways. Available in 1/4", 3/8" and 1/2" thicknesses. To choose the right ramp, you generally will measure the height from the sub-floor to the top of the hard surface and subtract a 1/2". However, if you are installing extremely thick or thin carpet, you may need a thicker or thinner ramp.